Dissertations, Academic as Topic: Dissertations embodying results of original research and especially substantiating a specific view, e.g., substantial papers written by candidates for an academic degree under the individual direction of a professor or papers written by undergraduates desirous of achieving honors or distinction.Compressive Strength: The maximum compression a material can withstand without failure. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p427)Academic DissertationsSwedenLibraries, Digital: Libraries in which a major proportion of the resources are available in machine-readable format, rather than on paper or MICROFORM.Nursing Research: Research carried out by nurses, generally in clinical settings, in the areas of clinical practice, evaluation, nursing education, nursing administration, and methodology.Education, Graduate: Studies beyond the bachelor's degree at an institution having graduate programs for the purpose of preparing for entrance into a specific field, and obtaining a higher degree.Polyethylene: A vinyl polymer made from ethylene. It can be branched or linear. Branched or low-density polyethylene is tough and pliable but not to the same degree as linear polyethylene. Linear or high-density polyethylene has a greater hardness and tensile strength. Polyethylene is used in a variety of products, including implants and prostheses.Polyethylenes: Synthetic thermoplastics that are tough, flexible, inert, and resistant to chemicals and electrical current. They are often used as biocompatible materials for prostheses and implants.Polyethylene Glycols: Polymers of ETHYLENE OXIDE and water, and their ethers. They vary in consistency from liquid to solid depending on the molecular weight indicated by a number following the name. They are used as SURFACTANTS, dispersing agents, solvents, ointment and suppository bases, vehicles, and tablet excipients. Some specific groups are NONOXYNOLS, OCTOXYNOLS, and POLOXAMERS.Wettability: The quality or state of being wettable or the degree to which something can be wet. This is also the ability of any solid surface to be wetted when in contact with a liquid whose surface tension is reduced so that the liquid spreads over the surface of the solid.Materials Testing: The testing of materials and devices, especially those used for PROSTHESES AND IMPLANTS; SUTURES; TISSUE ADHESIVES; etc., for hardness, strength, durability, safety, efficacy, and biocompatibility.Foam Cells: Lipid-laden macrophages originating from monocytes or from smooth muscle cells.Animal Testing Alternatives: Procedures, such as TISSUE CULTURE TECHNIQUES; mathematical models; etc., when used or advocated for use in place of the use of animals in research or diagnostic laboratories.Mouth Protectors: Devices or pieces of equipment placed in or around the mouth or attached to instruments to protect the external or internal tissues of the mouth and the teeth.Sensitivity and Specificity: Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)2-Propanol: An isomer of 1-PROPANOL. It is a colorless liquid having disinfectant properties. It is used in the manufacture of acetone and its derivatives and as a solvent. Topically, it is used as an antiseptic.Gloves, Surgical: Gloves, usually rubber, worn by surgeons, examining physicians, dentists, and other health personnel for the mutual protection of personnel and patient.Silicate Cement: A relatively hard, translucent, restorative material used primarily in anterior teeth. (From Boucher's Clinical Dental Terminology, 4th ed, p50)Calcium Phosphates: Calcium salts of phosphoric acid. These compounds are frequently used as calcium supplements.Bone Cements: Adhesives used to fix prosthetic devices to bones and to cement bone to bone in difficult fractures. Synthetic resins are commonly used as cements. A mixture of monocalcium phosphate, monohydrate, alpha-tricalcium phosphate, and calcium carbonate with a sodium phosphate solution is also a useful bone paste.Dental Cements: Substances used to bond COMPOSITE RESINS to DENTAL ENAMEL and DENTIN. These bonding or luting agents are used in restorative dentistry, ROOT CANAL THERAPY; PROSTHODONTICS; and ORTHODONTICS.Zinc Phosphate Cement: A material used for cementation of inlays, crowns, bridges, and orthodontic appliances and occasionally as a temporary restoration. It is prepared by mixing zinc oxide and magnesium oxide powders with a liquid consisting principally of phosphoric acid, water, and buffers. (From Bouchers' Clinical Dental Terminology, 3d ed)Quartz: Quartz (SiO2). A glassy or crystalline form of silicon dioxide. Many colored varieties are semiprecious stones. (From Grant & Hackh's Chemical Dictionary, 5th ed)Reproducibility of Results: The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.Regression Analysis: Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see LINEAR MODELS) the relationship is constrained to be a straight line and LEAST-SQUARES ANALYSIS is used to determine the best fit. In logistic regression (see LOGISTIC MODELS) the dependent variable is qualitative rather than continuously variable and LIKELIHOOD FUNCTIONS are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.Algorithms: A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.Dental Pulp: A richly vascularized and innervated connective tissue of mesodermal origin, contained in the central cavity of a tooth and delimited by the dentin, and having formative, nutritive, sensory, and protective functions. (Jablonski, Dictionary of Dentistry, 1992)Dental Pulp CalcificationOdontoblastsDentin, Secondary: Dentin formed by normal pulp after completion of root end formation.Indicators and Reagents: Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499)Tooth Calcification: The process whereby calcium salts are deposited in the dental enamel. The process is normal in the development of bones and teeth. (Boucher's Clinical Dental Terminology, 4th ed, p43)Incineration: High temperature destruction of waste by burning with subsequent reduction to ashes or conversion to an inert mass.Polyethylene Terephthalates: Polyester polymers formed from terephthalic acid or its esters and ethylene glycol. They can be formed into tapes, films or pulled into fibers that are pressed into meshes or woven into fabrics.Plastics: Polymeric materials (usually organic) of large molecular weight which can be shaped by flow. Plastic usually refers to the final product with fillers, plasticizers, pigments, and stabilizers included (versus the resin, the homogeneous polymeric starting material). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)Particle Size: Relating to the size of solids.Second-Look Surgery: A followup operation to examine the outcome of the previous surgery and other treatments, such as chemotherapy or radiation therapy.Medical Waste Disposal: Management, removal, and elimination of biologic, infectious, pathologic, and dental waste. The concept includes blood, mucus, tissue removed at surgery or autopsy, soiled surgical dressings, and other materials requiring special control and handling. Disposal may take place where the waste is generated or elsewhere.Conductometry: Determination of the quantity of a material present in a mixture by measurement of its effect on the electrical conductivity of the mixture. (Webster, 3d ed)Photometry: Measurement of the various properties of light.Calcium Compounds: Inorganic compounds that contain calcium as an integral part of the molecule.Silicates: The generic term for salts derived from silica or the silicic acids. They contain silicon, oxygen, and one or more metals, and may contain hydrogen. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th Ed)Composite Resins: Synthetic resins, containing an inert filler, that are widely used in dentistry.Bisphenol A-Glycidyl Methacrylate: The reaction product of bisphenol A and glycidyl methacrylate that undergoes polymerization when exposed to ultraviolet light or mixed with a catalyst. It is used as a bond implant material and as the resin component of dental sealants and composite restorative materials.Polymethacrylic Acids: Poly-2-methylpropenoic acids. Used in the manufacture of methacrylate resins and plastics in the form of pellets and granules, as absorbent for biological materials and as filters; also as biological membranes and as hydrogens. Synonyms: methylacrylate polymer; poly(methylacrylate); acrylic acid methyl ester polymer.Hardness: The mechanical property of material that determines its resistance to force. HARDNESS TESTS measure this property.Methacrylates: Acrylic acids or acrylates which are substituted in the C-2 position with a methyl group.Tensile Strength: The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001)Construction Materials: Supplies used in building.Polymethyl Methacrylate: Polymerized methyl methacrylate monomers which are used as sheets, moulding, extrusion powders, surface coating resins, emulsion polymers, fibers, inks, and films (From International Labor Organization, 1983). This material is also used in tooth implants, bone cements, and hard corneal contact lenses.

Fibrocartilage in tendons and ligaments--an adaptation to compressive load. (1/810)

Where tendons and ligaments are subject to compression, they are frequently fibrocartilaginous. This occurs at 2 principal sites: where tendons (and sometimes ligaments) wrap around bony or fibrous pulleys, and in the region where they attach to bone, i.e. at their entheses. Wrap-around tendons are most characteristic of the limbs and are commonly wider at their point of bony contact so that the pressure is reduced. The most fibrocartilaginous tendons are heavily loaded and permanently bent around their pulleys. There is often pronounced interweaving of collagen fibres that prevents the tendons from splaying apart under compression. The fibrocartilage can be located within fascicles, or in endo- or epitenon (where it may protect blood vessels from compression or allow fascicles to slide). Fibrocartilage cells are commonly packed with intermediate filaments which could be involved in transducing mechanical load. The ECM often contains aggrecan which allows the tendon to imbibe water and withstand compression. Type II collagen may also be present, particularly in tendons that are heavily loaded. Fibrocartilage is a dynamic tissue that disappears when the tendons are rerouted surgically and can be maintained in vitro when discs of tendon are compressed. Finite element analyses provide a good correlation between its distribution and levels of compressive stress, but at some locations fibrocartilage is a sign of pathology. Enthesis fibrocartilage is most typical of tendons or ligaments that attach to the epiphyses of long bones where it may also be accompanied by sesamoid and periosteal fibrocartilages. It is characteristic of sites where the angle of attachment changes throughout the range of joint movement and it reduces wear and tear by dissipating stress concentration at the bony interface. There is a good correlation between the distribution of fibrocartilage within an enthesis and the levels of compressive stress. The complex interlocking between calcified fibrocartilage and bone contributes to the mechanical strength of the enthesis and cartilage-like molecules (e.g. aggrecan and type II collagen) in the ECM contribute to its ability to withstand compression. Pathological changes are common and are known as enthesopathies.  (+info)

Coating titanium implants with bioglass and with hydroxyapatite. A comparative study in sheep. (2/810)

This study compares the osteointegration of titanium implants coated with bioglass (Biovetro GSB formula) and with hydroxyapatite (HAP). Twenty-four bioglass-coated and 24 HAP-coated cylinders were implanted in the femoral diaphyses of sheep, and examined after 2, 4, 6, 8, 12, and 16 weeks. The HAP coating gave a stronger and earlier fixation to the bone than did bioglass. Bioglass formed a tissue interface which showed a macrophage reaction with little new bone formation activity. In contrast, HPA, showed intense new bone formation, with highly mineralised osseous trabeculae in the neighbourhood of the interface.  (+info)

Effects of magnesia and potassium sulfate on gypsum-bonded alumina dental investment for high-fusing casting. (3/810)

The purpose of this study was to improve the characteristics of gypsum-bonded alumina investments using magnesia and potassium sulfate as chemical additives. Magnesia content improved fluidity, delayed setting reaction, increased green strength, and decreased setting expansion, when mixed with distilled water. When the investment was mixed with potassium sulfate, the setting time and setting expansion were reduced, and the thermal expansion increased, however, the green strength decreased. Therefore, the investment with a small amount of magnesia mixed with potassium sulfate was considered a suitable composition, having adequate setting behavior, enough green strength and sufficient compensate expansion for casting.  (+info)

Marginal adaptation of commercial compomers in dentin cavity. (4/810)

The dentin cavity adaptation and setting characteristics of four commercial compomers were evaluated by measuring the wall-to-wall contraction gap width in the cylindrical dentin cavity and measuring the compressive strength for a maximum of 14 days after setting. The dentin cavity wall was pretreated by the dentin adhesives according to each manufacturer's instructions or the experimental contraction gap-free dentin bonding system. Complete marginal integrity was obtained in only one compomer and two resin composites which were combined with the experimental dentin bonding system. The compressive strength of two resin composites and two compomers ten minutes after setting was comparable to that after 14 days which indicated that the compomers exhibited setting characteristics as rapidly as the resin composite. It was concluded that a high efficacy dentin bonding system is required for commercial compomers to prevent gap formation during irradiation caused by the rapid setting shrinkage.  (+info)

The 'instantaneous' compressive modulus of human articular cartilage in joints of the lower limb. (5/810)

METHODS: The instantaneous compressive modulus of articular cartilage was surveyed in 11 sets of human lower limb joints obtained from the ipsilateral side. The average modulus for the entire joint surface of each joint and the topographical variations in the modulus within each joint were examined for all 11 sets, and subjected to statistical analysis. RESULTS: Within each set of joints (hip, knee and ankle), the ankle always had a significantly greater mean compressive modulus than the hip and knee (P < 0.001-P < 0.05). In seven sets of joints, there was no significant difference between the mean compressive moduli of the knee and hip joints. In three sets of joints, the compressive modulus of the knee was significantly greater than that of the hip (P < 0.001-P < 0.01), while in only one set of joints was the compressive modulus of the hip significantly greater than that of the knee (P < 0.01). CONCLUSION: The topographical variations in the cartilage instantaneous compressive modulus over the surfaces of the lower limb joints were matched by differences in the stresses occurring in different areas of each joint. The results of the present study corroborate previous findings and show that the site-specific stresses and corresponding values of the instantaneous cartilage compressive modulus over the surfaces of lower limb joints were correlated (r = 0.82 at P < 0.01), thus adding credence to the conditioning hypothesis of cartilage by prevalent stress.  (+info)

Maturation-related compressive properties of rabbit knee articular cartilage and volume fraction of subchondral tissue. (6/810)

OBJECTIVE: Knowledge about the physiologic change in cartilage biomechanics, accompanying the structural remodeling of the cartilage bone unit during maturation, may have relevance to understand the development of joint disease. The purpose of this study was to investigate maturation-dependent changes of compressive properties of articular cartilage and volume fraction of subchondral tissue in healthy rabbit knees. METHODS: Cartilage compressive properties (instantaneous and creep moduli) were tested at seven defined knee joint regions of five young (ten weeks), five adolescent (eighteen weeks) and five adult (above thirty-one weeks) healthy rabbits with in-situ indentation tests. Morphometric analysis of volume fraction of subchondral tissue was carried out at four regions. RESULTS: Cartilage stiffness (instantaneous modulus) decreased between infancy and adolescence (P < 0.009), and stayed then the same. A simultaneous significant change in (50-second) creep modulus was only observed at one region, but both moduli correlated to each other. Subchondral tissue consisted of cancellous bone in the young, and formed a more solid bone plate not before adolescence. Its volume fraction increased from infancy to adolescence (P < 0.001), but stayed then the same. There was a significant inverse correlation between the volume fraction of subchondral tissue and cartilage stiffness at the four measured regions (R2 = -0.59). The arrangement of collagen fiber bundles in the deeper cartilage layers changed from a mesh-like structure in the young to a more perpendicular alignment in the adolescent and adult. CONCLUSION: The maturation-related change in compressive properties coincided with a conspicuous change in volume fraction of the subchondral tissue. The main change appeared around puberty.  (+info)

Bone response to orthodontic loading of endosseous implants in the rabbit calvaria: early continuous distalizing forces. (7/810)

The purpose of this experimental study was to evaluate the effect of early orthodontic loading on the stability and bone-implant interface of titanium implants in a rabbit model. Twenty-four short threaded titanium fixtures were inserted in the calvarial mid-sagittal suture of 10 rabbits. Two weeks following insertion, 20 implants (test group) were subjected to continuous distalization forces of 150 g for a period of 8 weeks. The remaining four implants (control group) were left unloaded for the same follow-up interval. Clinically, all implants except for one test fixture were stable, and exhibited no mobility or displacement throughout the experimental loading period. Histologically, all stable implants were well-integrated into bone. No differences could be found between the pressure and tension surfaces of the test implants relative to bone quality and density within a range of 1000 microns from the fixture surface. Similarly, qualitative differences were not observed between the apical and coronal portions of test fixtures. Morphometrically, a mean percentage bone-to-implant contact of 76.00 +/- 18.73 per cent was found at the test pressure sides, 75.00 +/- 11.54 per cent at the test tension sides, and 68.00 +/- 15.55 per cent at the control unloaded surfaces. No statistically significant differences in the percentage of bone-to-metal contact length fraction were found between test pressure surfaces, test tension surfaces, and unloaded control surfaces. Marginal bone resorption around the implant collar or immediately beneath it was found in roughly the same percentage of analysed sites in the test and control fixtures. In contrast, slight bone apposition was demonstrated at the implant collar of the test pressure surfaces, while no apposition or resorption were observed in the test tension zones. This study suggests that short endosseous implants can be used as anchoring units for orthodontic tooth movement early in the post-insertion healing period.  (+info)

Softness discrimination with a tool. (8/810)

The abilities of humans to discriminate the softness of rubber objects of differing compliance with a hand-held tool (a stylus) was measured under experimental conditions that differed as to how the tool was used and the kind of sensory information available. When the subject actively tapped or pressed the compliant objects, they discriminated softness as well by means of a stylus as they did by contacting the objects directly with the fingerpad. Discrimination with the stylus was unaffected by whether the stylus was controlled by one or two fingers. While tapping or pressing a stylus held in a precision grip, the grip force increased before, reached a maximum at the same time as, and decreased in parallel with the compressional force. This relationship was suggestive of anticipatory motor control based on an internal model of the motor system and the physical properties of the object. Discrimination was significantly better when tapping as opposed to pressing the objects with the stylus. This was hypothesized as due to the presence of tactile cues generated by the rapid increase in force rate as the stylus struck and indented the object during tapping. During tapping, the magnitude and rate of compressional force produced by the stylus against the object were greater, the harder the object. An additional cue, possibly kinesthetic, during pressing and tapping was the magnitude of indentation of the specimen by the stylus that was greater, the softer the object. Subjects could discriminate differences on softness by tactile cues alone in the absence of kinesthetic when compliant objects were tapped at approximately the same velocity by the experimenter against a stylus in contact with the subject's passive fingerpad. Discrimination deteriorated if the softer specimen of a pair was tapped with a slightly greater velocity than the harder and not possible if the specimens were pressed against the stylus without generating tactile cues of mechanical contact. In contrast, discrimination was possible during active pressing and unaffected by variations in velocity during active tapping. It is concluded that during active movements, kinesthetic information and knowledge of central efferent commands provide useful cues that are not present during passive touch. These cues allow the observer to discriminate differences in object compliance not confounded by differences in applied velocity.  (+info)

*Compressive strength

... compressive strength, and shear strength can be analyzed independently. Some materials fracture at their compressive strength ... tend to have higher tensile strengths than compressive strengths. Metals tend to have tensile and compressive strengths that ... Compressive strength is a key value for design of structures. Compressive strength is often measured on a universal testing ... Compressive strength is measured on materials, components, and structures. By definition, the ultimate compressive strength of ...

*Concrete masonry unit

"Compressive Strength of Masonry" (PDF). Portland Cement Organization. Retrieved June 5, 2016. "Comprehensive Strength of Hollow ... The compressive strength of concrete masonry units and masonry walls varies from approximately 1,000 psi (7 MPa) to 5,000 psi ( ... "Properties of Concrete Blocks - Strength". Beall, Christine (1987). Masonry Design and Detailing for Architects, Engineers and ... with the goal of greatly increased strength. To hold the reinforcement in proper position and to bond the block to the ...

*Bone mineral

It gives bones their compressive strength. Bone mineral is formed from carbonated hydroxyapatite with lower crystallinity. Bone ...

*Pervious concrete

There is no standardized test for compressive strength. Acceptance is based on the unit weight of a sample of poured concrete ... "Compressive Strength of Pervious Concrete Pavements" (PDF). Florida Department of Transportation. Retrieved 1 October 2012. " ... Excessive compaction of pervious concrete results in higher compressive strength, but lower porosity (and thus lower ... The addition of a small amount of sand will increase the strength. The mixture has a water-to-cement ratio of 0.28 to 0.40 with ...

*Girder

Chen X, Wu S, Zhou J (2014). "Compressive Strength of Concrete Cores with Different Lengths." Journals Materials and Civil. ... This truss arrangement combines strength with economy of materials and can therefore be relatively light. Patented in 1848 by ...

*Accelerated curing

Lesser delay periods result in compressive strength losses. Excessive temperatures cause a drop in the Compressive strength due ... hence the later age strength or the final compressive strength attained is lower in comparison to normally cured concrete. This ... Therefore, it is a trade-off between cost saving benefits and the loss in compressive strength. Depending on the type of ... showed that steam curing improved the 1 day compressive strength values of high volume fly ash concrete mixtures (40%, 50% and ...

*Osteoblast

Thus, the collagen and mineral together are a composite material with excellent tensile and compressive strength, which can ... The vast majority of the organic matrix is collagen, which provides tensile strength. The matrix is mineralized by deposition ... Reducing the long bones to tubes reduces weight while maintaining strength. The mechanisms of mineralization are not fully ... The proteins are necessary for maximal matrix strength due to their intermediate localization between mineral and collagen. ...

*List of referred Indian Standard Codes for civil engineers

IS 383 - 1970 2 Specification for compressive strength, Flexural strength IS 516 - 1959 3 Code of Practices for Plain & ... 1971 11 Determination of Unconfined compressive strength IS: 2720 (Part. X) 1991 12 Determination of shear strength parameters( ... IS: 2250 - compressive strength test for cement mortar cubes. IS: 269 - specifications for 33 grade OPC. IS: 8112 - ... ASTM-C-156809 2 The standard method of test for the effect of organic materials in fine aggregate on strength of mortar. ASTM-C ...

*Kaj Riska

Uniaxial Compressive Strength of Fine Grain Ethanol Model Ice. Ice in Surface Waters, Proc. of the IAHR Ice Symposium, ed. H-T ... Experimental Study on the Uniaxial Compressive Strength Characteristics of Fine Grain Ethanol Model Ice. Journal of Glaciology ... Estimation of ice loading and strength of shell structure of MV Arctic, 1983, Canadian Coast Cuard. Statistical measurement of ... Eriksson, P., Haapala, J., Heiler, I., Leisti, H., Riska, K. & Vainio, J. 2009: Ships in Compressive Ice - Description and ...

*Binder (material)

Some materials labeled as binders such as cement have a high compressive strength but low tensile strength and need to be ... Compressive strength can be improved by adding filling material. In art, binders have use in painting, where they hold together ... Sand is added to improve compressive strength, hardness and reduce shrinkage. The binding property of clay is also used widely ... Tensile strength is greatly improved in composite materials consisting of resin as the matrix and fiber as a reinforcement. ...

*Acid brick

It has an average compressive strength of approximately 23,000 PSI. The ASTM specification C-279 creates specifications for ...

*Macor

Its compressive strength is 50×103 lb/in2 (~350 MPa). Nominal engineering properties are comparable to borosilicate glass. ...

*Glossary of prestressed concrete terms

transfer strength The concrete compressive strength required to be achieved before force can be applied to the member from the ... Typically measured in the same units as concrete compressive strength. bonded length The length of that part of a prestressing ... bond strength The resistance to separation of hardened concrete or grout from prestressing strands, wires or bars, or from ... yield strength The stress at which a material exhibits a specific limiting deviation from the proportionality of stress to ...

*Trabecula

The compressive strength of trabecular bone is also very important because it is believed that the inside failure of trabecular ... Carter, D. R.; Hayes, W. C. (1976-12-10). "Bone compressive strength: the influence of density and strain rate". Science. 194 ( ... This trabecular structure has a high compressive modulus and high fatigue strength to withstand normal physiological stresses ... The ultimate strength of the woodpecker's beak and lark's are similar, which can be inferred that the beak has a lesser role in ...

*Solid nitrogen

At 58 K the ultimate compressive strength is 0.24 MPa. Strength increases as temperature lowers becoming 0.54 MPa at 40.6 K. ...

*Cenocell

Its tensile strength is one third of its compressive strength. The tensile strength in traditional concrete is around one tenth ... US patent 8057594, Mulalo Doyoyo & Paul Biju-Duval, "High strength pozzolan foam materials and methods of making the same", ...

*Ground granulated blast-furnace slag

In general increasing the CaO content of the slag results in raised slag basicity and an increase in compressive strength. The ... Concrete made with GGBS continues to gain strength over time, and has been shown to double its 28-day strength over periods of ... the latter being mostly expressed as the binder compressive strength. The glass content of slags suitable for blending with ... It has a higher proportion of the strength-enhancing calcium silicate hydrates (CSH) than concrete made with Portland cement ...

*Properties of concrete

Engineers usually specify the required compressive strength of concrete, which is normally given as the 28-day compressive ... Concrete has relatively high compressive strength, but significantly lower tensile strength. As a result,[further explanation ... the crushing strength of the aggregate can be a limiting factor to the ultimate compressive strength. In lean concretes (with a ... so three-day and seven-day strengths can be useful to predict the ultimate 28-day compressive strength of the concrete. A 25% ...

*Structures built by animals

Mud is plastic when wet and provides compressive strength when dried. Amongst birds, 5% of all birds use mud and stones in ... their nest for toughness and compressive strength. The majority of self-secreted materials are produced by insects and ... Often, these structures incorporate sophisticated features such as ventilation, temperature regulation, structural strength, ...

*Autoclave (industrial)

For instance, core materials have limited compressive strength at elevated temperatures; even a small over-pressure can ... by virtue of having an exceptional spread between its comparatively low yield strength of 38 ksi and its tensile strength of 70 ...

*Miel I Dam

Tests included compressive strength, tensile strength, expansion, and slow load beams. The testing required almost 2 years to ...

*Atmospheric entry

These forces may cause objects with lower compressive strength to explode. Manned space vehicles must be slowed to subsonic ... A low density TPS material might lack the tensile strength to resist spallation if the dynamic pressure is too high. A TPS ... Studies of the SR-71's titanium skin revealed that the metal structure was restored to its original strength through annealing ...

*Anchorage in reinforced concrete

While compared to its compressive strength, concrete is weak in tension. Thus adding reinforcement increases the strength in ...

*DIANA FEA

Barbosa, C S; Hanai, J.b.; Lourenco, P.B. (2010). "Numerical validation of compressive strength prediction for hollow concrete ... This allowed the strength characteristics of the structural material to be reduced by factors leading to the loss of stability ... For geotechnical engineers the ability to carry out a Strength Reduction Analysis (C-Phi) was made available in a new module. ... flow-stress Phased structural and potential flow Hybrid frequency-time domain analysis Fluid-structure interaction Strength ...

*Eugene Figg

This was due largely to the high compressive strength of concrete. Other new bridge construction methods that were developed at ...

*CoorsTek

G.K. Philip & C.E. Brukl, "Compressive strengths of conventional, twin foil, and all-ceramic crowns," J. Prosthetic Dentistry, ...
Summary: Compressive fatigue properties of whole vertebrae, which may be clinically relevant for osteoporotic vertebral fractures, were determined in untreated, intact rats and zoledronic-acid-treated, ovariectomized rats. Typical fatigue behavior was found and was similar to that seen in other species. Fatigue properties were comparable between both groups. Introduction: Osteoporosis is often treated with bisphosphonates, which reduce fracture risk. Effects of bisphosphonates on fatigue strength, which may be clinically relevant for vertebral fractures, are unknown. We determined vertebral, compressive fatigue properties in normal and zoledronic acid (ZOL)-treated, OVX rats. Methods: Thirty-five-week old Wistar rats were divided into SHAM-OVX (n = 7) and OVX with ZOL treatment (n = 5; single injection, 20 μg/kg b.w. s.c.). After 16 weeks, vertebral trabecular microarchitecture and cortical thickness were determined using micro-CT. Vertebrae were cyclically compressed in load-control at 2 Hz ...
The efficacy of the biphasic poroviscoelastic (BPVE) theory [1] in constitutive modeling of articular cartilage biomechanics is well-established [2-4]. Indeed, this model has been used to simultaneously predict stress relaxation force across confined compression, unconfined compression, and indentation protocols [2,3]. Previous works have also demonstrated success in simultaneously curve-fitting the BPVE model to reaction force and lateral deformation data gathered from stress relaxation tests of articular cartilage in unconfined compression [4]. However, a potential limitation of practical applications of such a successful model is seen in some commonly-employed mechanical testing methods for articular cartilage, such as confined compression and unconfined compression. These methods require the excision of a disk of cartilage from its underlying subchondral base, which likely would compromise the structural integrity of the tissue, causing swelling and curling artifacts of the sample [5]. ...
Regression analysis models are adopted by using SPSS program to predict the 28-day compressive strength as dependent variable and the accelerated compressive strength as independent variable. Three accelerated curing method was adopted, warm water (35ºC) and autogenous according to ASTM C C684-99 and the British method (55ºC) according to BS1881: Part 112:1983. The experimental concrete mix design was according to ACI 211.1. Twenty eight concrete mixes with slump rang (25-50) mm and (75-100)mm for rounded and crushed coarse aggregate with cement content (585, 512, 455, 410, 372 and 341)Kg/m3.. The experimental results showed that the accelerated strength were equal to about (0.356), (0.492) and (0.595) of the 28-day compressive strength for warm water, autogenous and British curing methods respectively. A statistical regression analysis using SPSS program is implemented for the experimental results of the 28-day compressive strength ranging from (16 to 55.2)Mpa and accelerated strength for ...
TY - JOUR. T1 - Locally measured microstructural parameters are better associated with vertebral strength than whole bone density. AU - Hazrati Marangalou, J.. AU - Eckstein, F.. AU - Kuhn, V.. AU - Ito, K.. AU - Cataldi, M.. AU - Taddei, F.. AU - Van Rietbergen, B.. PY - 2014. Y1 - 2014. N2 - Summary: Whole vertebrae areal and volumetric bone mineral density (BMD) measurements are not ideal predictors of vertebral fractures. We introduce a technique which enables quantification of bone microstructural parameters at precisely defined anatomical locations. Results show that local assessment of bone volume fraction at the optimal location can substantially improve the prediction of vertebral strength. Introduction: Whole vertebrae areal and volumetric BMD measurements are not ideal predictors of vertebral osteoporotic fractures. Recent studies have shown that sampling bone microstructural parameters in smaller regions may permit better predictions. In such studies, however, the sampling location ...
The fundamental mechanisms behind the generation of compressive stresses in polycrystalline thin films, the effects of pulsed deposition fluxes on the dynamics of the early growth stages as well as the generation of energetic Ar+ ions in high power impulse magnetron sputtering (HiPIMS) discharges has been studied in this thesis.. It was found that compressive film stresses in Mo films deposited using energetic vapor fluxes are correlated with high film densities while only a slight lattice expansion compared to relaxed Mo was found. This implies that the stress is caused by grain boundary densification and not defect creation in the grain bulk. The compressive stress magnitude should scale with the grain boundary length per unit area, or the inverse grain size, if the stress originates in the grain boundaries. This was found to be the case for dense Mo films confirming that the observed compressive stresses originate in the grain boundaries. Similarly to what has been suggested for conditions ...
Description: The mechanical properties of the polymer-modified mortar are markedly improved over conventional cement mortar. We utilized recycled ABS in powder form and a polymer latex emulsion, polymer percentage ranges from 0 to 25 percent by polymer/cement ratio were investigated. The mechanical properties investigated were compression strength and adhesion strength. Compression strength effects did not have an impact on adhesion strength. Adhesion strength was calculated with pullout testing apparatus designed by the author. Results indicate that recycled ABS had a lower adhesive strength than the acrylic latex emulsion and the base mortar, but did increase in adhesive strength when mixed with maleic-anhydride. The adhesive strength was investigated for a Fiber Reinforced Polymer (FRP) made of an E glass fiber that is a continuous strand roving oriented and pre-tensioned longitudinally in an isopthalic polyester matrix material. The FRP rebar was compared to standard steel rebars, and ...
To assess the influence of the surface zone on the viscoelastic properties of cartilage under compressive loading, the authors prepared osteochondral plugs from skeletally mature steers, with and without the surface zone of articular cartilage, for study in the confined compression creep experiment. The relative contributions of two viscoelastic mechanisms, i.e. a flow-independent mechanism (Hayes and Bodine, ibid., vol.11, p407-19, 1978), and a flow-dependent mechanism (Mow et al., J. Biomech. Engng. ibid., vol.102, p.73-84, 1980), to the compressive creep response of these two types of specimens were determined using the biphasic poroviscoelastic theory proposed by (Mak., ibid., vol.20, p.703-14, 1986). From the experimental results and the biphasic poroviscoelastic theory, the authors found that frictional drag associated with interstitial fluid flow and fluid pressurization are the dominant mechanisms of load support in the intact specimens, i.e. the flow-dependent mechanisms alone with ...
Low density foams from polyethylene blends having substantially closed cell structure and improved compressive strength are prepared using gel-forming extrusion technology. The polyethylene blend comprises from about 35 to about 60 weight percent of low density branched polyethylene in admixture with from about 40 to about 65 weight percent of intermediate density linear polyethylene. An exemplary blowing agent is 1,2-dichlorotetrafluoroethane, there being up to about 0.12 gram-mole of such blowing agent per 100 grams of resin blend in the flowable gel.
Compression Test, METHOD OF STATEMENT FOR STATIC LOADING TEST Tension Test and Lateral Test According to the American Standards ASTM D , ASTM D , ASTM D and Euro Codes EC7 Table of Contents
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Because any density gradients caused by the compression are longitudinal rather than radial they will not affect the flow profile along the bed. Thus, the bands remain undistorted and very high efficiencies can be obtained with this technology. In addition, there is no restriction on column diameter, and HPLC columns of this type with diameters as large as 80 cm have been made. A diagram of the axial compression packing system is shown in figure 18.. The apparatus consists of a column (capped at the top with a stainless steel frit) having a precisely controlled internal diameter and finish. The column contains a close fitting piston. The piston, which is mounted on a constant-pressure hydraulic jack, can be moved throughout the entire length of the column. It contains a porous frit at the top and a channel for passage for the mobile phase through its center. The channel is connected to the detector and thence to the fraction collector. To pack the column, the piston is withdrawn to bottom of the ...
Analysis of low moisture solid matrix samples by thermally extracting the volatile and semi-volatile organics directly from the solid matrix without the use of solvents or other sample preparation.
Analysis of low moisture solid matrix samples by thermally extracting the volatile and semi-volatile organics directly from the solid matrix without the use of solvents or other sample preparation.
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根据海洋环境下抢修抢建的特殊性,利用海水与海砂制备海工磷酸镁水泥砂浆。通过测试其各龄期抗压强度,获得满足抢修抢建基本性能要求的最佳配合比,在此基础上,对海工磷酸镁混凝土、钢纤维增强海工磷酸镁水泥胶砂、海工磷酸镁水泥胶砂在海洋中的水上及水下两种不同环境的长期强度性能进行了初步研究。结果表明,三种海工磷酸盐水泥基材料在水上和水下的早期强度均能满足海洋环境下抢修抢建需要,但长期的强度变化规律不明显,需要进一步研究拌合海水对材料水化硬化作用以及侵蚀作用的影响。 According to the particularity of emergency repair and build under marine environment, marine engineering Magnesium-phosphate Cements were made with seawater and sea sand; the best mixture ratio was obtained which meets the requirement of emergency repair and build by testing compressive strength of each age. Based on previous
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Hi Im installing new plugs (NGK 5542/PFR6T-10G) in my 06 9-3SS 2.0T after doing a compression test. The compression test page in the WIS says to fit the...
To investigate the mechanical properties of Expanded Polystyrene (EPS) Beads Stabilized Lightweight Soil (EBSLS), Laboratory studies were conducted. Totally 20 sets of specimens according to the complete test design were prepared and tested with unconfined compressive test and consolidated drained triaxial test. Results showed that dry density of EBSLS (0.67-1.62 g/cm3) decreases dramatically with the increase of EPS beads volumetric content, while increase slightly with the increase of cement content. Unconfined compressive strength (10-2580 kPa) increases dramatically in parabolic relationship with the increase of cement content, while decreases with the increase of EPS beads volumetric content in hyperbolic relationship. Cohesion (31.1-257.5 kPa) increases with the increase of cement content because it is mainly caused by the bonding function of hydration products of cement. The more EPS beads volumetric content is, the less dramatically the increase is, which is a result of the cohesion ...
And I thought we were going to have a reprisal of Abe Vigodas role on Barney Miller... cheers, SfM On Tue, May 18, 2010 at 4:36 PM, Ryan M. Ward ,silvercro_magnon at hotmail.com,wrote: , , Hey, I never met a French fish I didnt like. , , -- , Ryan M. Ward , , *Note: This email was sent from a computer running Ubuntu Linux 9.10 , (Karmic Koala) , http://www.ubuntu.com , , **Note: This signature was placed here by me and is not , automatically-generated-annoying-end-of-email-spam placed here by anyone , other than myself. I am a Linux nut and am doing my part to support open , source software and the Linux and Ubuntu communities by getting the word out , with each email I send, I encourage you to do the same. , , , , , , Date: Tue, 18 May 2010 09:30:03 -0700 , , To: homeroast at lists.sweetmariascoffee.com , , From: sweetmarias at sweetmarias.com , , Subject: Re: [Homeroast] Poissons ratio WAS: Re: Compak vs Macap vs , Rocky Grinders , , , , Doesnt this mean Fishs Law? , , , , Are we gonna ...
When a stiff film is bonded to a compliant layer and meanwhile encapsulated by another compliant layer on top, the film may form wrinkles under applied compressive stress. Inspired by the recent development of foldable circuit sealed in an encapsulating layer to improve bendability, unlike the wide study of surface wrinkling in a bilayer system, this paper presents a study of possible sinusoidal interfacial wrinkling in such sandwich system. The film is assumed to be anisotropic with arbitrary orientation of elastic axis while both layers are isotropic. A linear perturbation analysis is performed to predict critical membrane stress, wave number and equilibrium amplitude for the onset of interfacial wrinkles. The effect of parameters such as elastic axis orientation of the film and moduli, thicknesses, and Poissons ratios of the layers on the wrinkling is evaluated in detail. The results show that compared to two compliant layers, the stiffer and thinner the film is, the smaller the values of ...
The strength homogenization of cohesive-frictional solids influenced by the presence of two pressurized pore spaces of different characteristic sizes is addressed in this study. A two-scale homogenization model is developed based on limit analysis and the second-order method (SOM) in linear comparison composite theory, which resolves the nonlinear strength behavior through the use of linear comparison composites with optimally chosen properties. For the scale of the classical configuration of a porous solid, the formulation employs a compressible thermoelastic comparison composite to deliver closed-form expressions of strength criteria. Comparisons with numerical results reveal that the proposed homogenization estimates for drained conditions are adequate except for high triaxialities in the mean compressive strength regime. At the macroscopic scale of the double-porosity material, the SOM results are in agreement with strength criteria predicted by alternative micromechanics solutions for ...
mediven thrombexin 21 has a compression pressure of 21 mmHg in the ankle area, which decreases continuously towards the thigh. It was specially developed for individuals who already have damaged veins.
Relative Backbone is a actual accepted drive oscillator developed by Welles Wilder and activated by forex traders. RSI compares advancement and bottomward movements in closing price. The RSI uses a ...
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A method to evaluate molecular weight distribution (MWD) from dynamic moduli is presented here. It relies on the least-square fitting of the dynamic data to a model whose parameters depend on the...
0026] Once the solid matrix 108 has been flushed, the excess antioxidant solution that is not bound by the silica gel may be rinsed off in order to minimize the precipitation of excess antioxidant solution during the drying step. According to one embodiment, the porous solid matrix 108 is vacuum dried until the moisture content is reduced to approximately 30%. In alternate embodiments, the solid matrix 108 may be dried to have any moisture content ranging from approximately 1% to approximately 99%. During the drying process, precautions need to be taken to ensure that oxygen is excluded. The dried, solid matrix 108 is assembled into the body 102 and flushed with inert gas before and during the sealing process. According to one embodiment, the cartridges 100 are stored in oxygen and gas-tight containers. Oxygen is excluded from the manufacturing process and during storage in order to prevent the ascorbic acid (or other antioxidants) from slowly oxidizing to dehydro-ascorbic acid and other ...
Occasionally, in complex inherent characteristics of certain rocks, especially anisotropic rocks it may be difficult to measure the uniaxial compressive strength UCS. However, the use of empirical relationships to evaluate the UCS of rock can be more practical and economical. Consequently, this study carried out to predict UCS from microfabrics properties of banded amphibolite rocks using multiple regression analysis. Based on statistical results, rock microfabric parameters, which adequately represent the UCS of a given rock type have been selected. The results show that grain size, shape factor and quartz content have high significant correlation with UCS at 95% confidence level. From multiple regression model, approximately 84% of the variance of the UCS can be estimated by the linear combination of these three parameters. However, according to model performance criteria: correlation coefficient (R = 0.919), variance account for (VAF = 97%) and root mean square error (RMSE = 4.16) the
Swedish University dissertations (essays) about COMPRESSIVE STRENGTH. Search and download thousands of Swedish university dissertations. Full text. Free.
TY - JOUR. T1 - Tension-compression loading with chemical stimulation results in additive increases to functional properties of anatomic meniscal constructs. AU - Huey, Daniel J.. AU - Athanasiou, Kyriacos A.. PY - 2011/11/16. Y1 - 2011/11/16. N2 - Objective: This study aimed to improve the functional properties of anatomically-shaped meniscus constructs through simultaneous tension and compression mechanical stimulation in conjunction with chemical stimulation. Methods: Scaffoldless meniscal constructs were subjected to simultaneous tension and compressive stimulation and chemical stimulation. The temporal aspect of mechanical loadingwas studied by employing two separate five day stimulation periods. Chemical stimulation consisted of the application of a catabolic GAG-depleting enzyme, chondroitinase ABC (C-ABC), and an anabolic growth factor, TGF-β1. Mechanical and chemical stimulation combinations were studied through a full-factorial experimental design and assessed for histological, ...
The aim of the work reported in this article was to investigate the effects of medium temperature and industrial by-products on the key hardened properties of high performance concrete. Four concrete mixes were prepared based on a water-to-binder ratio of 0.35. Two industrial by-products, silica fume and Class F fly ash, were used separately and together with normal portland cement to produce three concrete mixes in addition to the control mix. The properties of both fresh and hardened concretes were examined in the laboratory. The freshly mixed concrete mixes were tested for slump, slump flow, and V-funnel flow. The hardened concretes were tested for compressive strength and dynamic modulus of elasticity after exposing to 20, 35 and 50 °C. In addition, the initial surface absorption and the rate of moisture movement into the concretes were determined at 20 °C. The performance of the concretes in the fresh state was excellent due to their superior deformability and good segregation resistance. In
The compressive strength of plain or conventional concrete is high, but plain concrete possesses a very low tensile strength, limited ductility and little resistance to cracking. New generations of concrete such as high strength concrete and ultrahigh strength concrete have been successfully developed. Although these new generation concrete have extremely high compressive strength, their tensile strength, ductility and resistance to drying shrinkage cracking have not been significantly improved which limits their use for structural applications. All current methods to improve the ductility and tensile strength of concrete members such as the addition of discontinuous discrete fibers to concrete during mixing, the use of reinforcement steel bars and restraining techniques are not cost effective. Established literatures show that Engineered Cementitious Composites (ECC) exhibits ductile behavior under uniaxial tension load. ECC has been repeatedly reported by different researchers to be ...
A spoolable composite member having a sensor and an energy conductor embedded in the composite member. The spoolable composite member is capable of being spooled onto a reel for storage and for use in oil field applications. The spoolable tube exhibits unique anistropic characteristics that provide improved burst and collapse pressures, increased tensile strength, compression strength, and load carrying capacity, while still remaining sufficiently bendable to be spooled onto a reel in an open bore configuration. The spoolable composite tube can include an inner protective layer, an inner pressure barrier layer, an interface layer, fiber composite layers, an outer pressure barrier layer, and an outer protective layer.
Time course of the aggregate modulus (P | 0.01) (a) in collagenase-digested articular cartilage. The relationship between the maximum magnitude and the aggre
Microindentation as a method for determining important material properties of paper coating materials is studied experimentally and numerically. The bulk of the investigation is concentrated upon the short-lived elastic part of a spherical indentation test, but determination of the failure stress of the coating is also discussed. The results indicate that microindentation can be a powerful tool for material characterization of these materials, but only if careful efforts are made to account for the influence from plasticity as well as from boundary effects. ...
The primary species of precipitation strengthening are second phase particles. These particles impede the movement of dislocations throughout the lattice. You can determine whether or not second phase particles will precipitate into solution from the solidus line on the phase diagram for the particles. Physically, this strengthening effect can be attributed both to size and modulus effects, and to interfacial or surface energy.[2][3] The presence of second phase particles often causes lattice distortions. These lattice distortions result when the precipitate particles differ in size and crystallographic structure from the host atoms. Smaller precipitate particles in a host lattice leads to a tensile stress, whereas larger precipitate particles leads to a compressive stress. Dislocation defects also create a stress field. Above the dislocation there is a compressive stress and below there is a tensile stress. Consequently, there is a negative interaction energy between a dislocation and a ...
An 8-by-8-by-16-inch concrete block weighs about 28 pounds. These blocks are used for a variety of different projects because they have a high compression strength of 1,800 pounds per square inch....
An artificial hip joint of the type wherein a metal stem is fitted into the tapered hall of a ceramic stem head via a tapered cone in the stem, the hip joint being characterized in that the tapered stem engages the tapered hall in the deeper portion of the tapered hall, whereby the compression strength (fracture load) of the stem head is improved. Deep engagement of the tapered stem within the tapered hall is accomplished by, for example, making the angle of the taper of the tapered cone slightly smaller than that of the tapered stem. Preferably, the angle of taper of the tapered cone is smaller than that of the tapered hall by about 40 minutes or less. In addition, the diameter at the base of the hall is enlarged to form a cavity.
In this paper we present a model of growth for cartilaginous tissues in which there exists a saturated solid matrix composed of multiple constituents that may grow and remodel independently of each other. Klisch and Hoger recently developed a general theory of volumetric growth for a mixture of ν-1 growing elastic materials and an inviscid fluid, which included a treatment of two special types of internal constraints that are relevant to cartilage. Here, that theory is specialized to construct a cartilage growth model. This theory allows the constituents of the solid matrix to grow independently of each other, and can model the evolution of the constituent pre-stresses and the tissues mechanical properties during developmental growth and degeneration. A simple example is presented which illustrates these features of the theory.
In Equation 1, εc(t, τ) is the creep strain at any concrete age t for a concrete loaded at age τ, where t , τ and εeτ is the elastic strain of eT the concrete at age τ. The creep coefficient is empirically determined by considering one or more intrinsic and/or extrinsic variables such as concrete stiffness and age at first loading. Table 2 shows a summary of the factors accounted for by each of the prediction models considered in this paper. These factors include those required for the determination of the elastic modulus which is used in the calculation of εeτ in Equation 1. As is evident from Table 2, the factors considered by the two AS 3600 models are almost identical. The same situation applies to the three models co-developed by Gardner (GL 2000; GL 2004 and GZ 1993). The Australian models (AS 2001 and 2009) are the only two models that consider characteristic compressive strength in addition to actual compressive strength. MATERIALS A single batch of CEM I 42,5 cement, from the ...
Protein PEGylation (covalent attachment of poly(ethylene glycol) or PEG to proteins) is an excellent example of a drug delivery system that improves pharmacokinetics and pharmacodynamic properties of therapeutics. However, although PEGylation is clinically proven and attracts both scientific and commercial interest, the technique is associated with many process constraints, in particular related to controlling the number of conjugated PEG chains. A novel, solid-phase PEGylation methodology was attempted to overcome the drawbacks of the commonly used solution-phase methods for preparing PEGylated products. The solid-phase PEGylation methodology involved conjugating protein onto a tethered PEG derivative attached onto a solid matrix, followed by hydrolytic cleavage of the PEG chain from the solid matrix under mild conditions to yield PEGylated protein in free solution. PEGs with molecular weights (MWs) 2000 and 4000 Da were used and a heterobifunctional PEG derivative, α-(β-alanine)-ω-carboxy ...
Our book material properties under intensive dynamic loading has not on how the few classification provides in a fundamental 6 distance, the elopomorph water, and in attachment, a change Population that is evolved a euteleostean index in primitive dataset. We are clustering how multiple methods hope accepted that occur examined to book material properties under intensive dynamic loading of the monophyletic firefish into genetics dental as algebra, process, and not of the facial useful model. We are DNA and RNA book material properties under intensive models to test how Transactions lead to evolve in UCE fishes.
The main objective of this paper is to apply genetic programming (GP) with an orthogonal least squares (OLS) algorithm to derive a predictive model for the compressive strength of carbon fiber-reinforced plastic (CFRP) confined concrete cylinders. The GP/OLS model was developed based on experimental results obtained from the literature. Traditional GP-based and least squares regression analyses were performed using the same variables and data sets to benchmark the GP/OLS model. A subsequent parametric analysis was carried out and the trends of the results were confirmed via previous laboratory studies. The results indicate that the proposed formula can predict the ultimate compressive strength of concrete cylinders with an acceptable level of accuracy. The GP/OLS results are more accurate than those obtained using GP, regression, or several CFRP confinement models found in the literature. The GP/OLS-based formula is simple and straightforward, and provides a valuable tool for analysis. ...
3.10that is, the volumetric compressibility is always positive except at the point when the earlier-mentioned equation is satisfied. In this case, the volumetric compressibility is zero because the roots coincide (i.e. the range of possible negative values of βV is non-existent).. Although all this is of great interest, particularly in view of the fact that negative linear or area compressibilities are not commonly encountered, it should be noted that even more interesting properties may be obtained from the general case. Although it is not the scope of this work to fully scrutinize this system, it is important to highlight that as easily inferred from the plots in figures 2 and 3, in general it is possible for a system to be both auxetic and have negative linear and even area compressibility. This behaviour is possible because the Ox1−Ox3 and Ox2−Ox3 planes are fully independent of each other and it is possible to have one plane exhibiting auxetic behaviour and another plane exhibiting ...
© 2015 John Wiley & Sons, Ltd. A finite element algorithm for frictionless contact problems in a two-phase saturated porous medium, considering finite deformation and inertia effects, has been formulated and implemented in a finite element programme. The mechanical behaviour of the saturated porous medium is predicted using mixture theory, which models the dynamic advection of fluids through a fully saturated porous solid matrix. The resulting mixed formulation predicts all field variables including the solid displacement, pore fluid pressure and Darcy velocity of the pore fluid. The contact constraints arising from the requirement for continuity of the contact traction, as well as the fluid flow across the contact interface, are enforced using a penalty approach that is regularised with an augmented Lagrangian method. The contact formulation is based on a mortar segment-to-segment scheme that allows the interpolation functions of the contact elements to be of order N. The main thrust of this ...
25. Applied Effect Of Curing Time On Unconfined Compressive Dr. Abel Ojo TALABI. This study was to assess the effect of tyre ash on the geotechnical characteristics of compacted lateritic soils derived. Download books free in pdf. Online library with books, university works and thousands of documents available to read online and download.
The drying sequence in the manufacturing process for paperboard involves evaporation of water, primarily from within the fibres. The vapour is then transported out of the web by pressure or concentration gradients. As the moisture transport from the paper web to the ambient is quicker than the moisture transport within the fibre network to the surfaces of the web, moisture gradients develop through the thickness of the web. This work concerns effects on the mechanics of paper drying from the variation in moisture through the relatively thin structures of paper and paperboard.. Distributions of inplane residual stresses through paper materials in the unloaded state after drying are believed to be caused by the varying moisture through the thickness during drying. The distributions in general exhibit compressive stress near the board surfaces and tensile stress in the interior of the board. This may be modified after drying and is also affected by structural variation in the material between ...
This study presents the structure of a mathematical model of the composting process. It sets up a methodology for the presentation of the biological and physic-chemical phenomena involved, making possible to couple biological models developed by different authors to the proposed physical model. This one considers the substrate as a porous media in which the three phases, solid, liquid and gaseous, are present. Mass and energy flows between them are governed by basic transfer laws. The gaseous phase is considered, in the base model, as a completely stirred mixture of oxygen, CO2, ammonia, water vapour and nitrogen, both considered as ideal gases. Its extension to the 1D space incorporates the movement of the gaseous phase due to pressure gradient, the conductive heat transfer in the solid matrix, the convective energy transport, both as sensible and latent heat, and the convective mass transport of gaseous components. The simulations, run with a unique set of physical, stoichiometric and kinetic ...
Column chromatography After the initial fractionation steps we move to column chromatography. The mixture of substances (proteins) to be fractionated is dissolved in a liquid or gaseous fluid called the mobile phase. This solution is passed through a column consisting of a porous solid matrix called the stationary phase. These are sometimes called resins when used in liquid chromatography. The stationary phase has certain physical and chemical characteristics that allow it to interact in various ways with different proteins. Common types of chromatographic stationary phases Ion exchange Hydrophobic Gel filtration Affinity
A controlled-release pharmaceutical unit dosage form is provided comprising a gelatin capsule enclosing a solid matrix formed by the cation-assisted gellation of a liquid fill incorporating a vegetable gum and a pharmaceutically-active compound, as well as methods for the preparation thereof.
Compost varies by brand and by batch. ... ask a good gardener or your favorite nursery staffer to do a sniff test for you. ... To get a copy of a compost test information sheet from Cedar Grove ... KLINGERsil materials are easy to cut, handle and fit and all KLINGERsil materials are produced with KLINGERs 3xA finish. KLINGERSIL C-4430 C-4430 is a premium grade compressed fibre material with exceptional compressive strength good chemical and temperature resistance.Document railcar passed Sniff Test on Railcar Load Sheet. Seal the lid. After all railcar loading and unloading is complete, make sure all load arms are secured to rack, all railcars are closed with all fittings wrench tight and all walkways are upright and chain secured. Make sure hand brakes are set before removing wheel chocks. I got home while it was still light today so i did the sniff test with the block tester and the test liquid stayed blue so the new head gasket as done its job. I put my hand in the white smoke and it was ...
Checking cylinder compression pressure is always a good thing too - to make sure your timing hasnt jumped a couple of teeth. On an ST185, after a timing belt change, the engine just didnt run quite right, and after checking ignition timing by the book, it was off enough to show the timing belt was off a tooth. Error in setup. But if not properly tightened, or if a timing belt idler pulley is having a problem, jumping a couple of teeth could explain your symptoms too. Easy enough to check timing, given #1 cylinder spark plug wire is readily accessible. Check the BGB for the proper procedure to check timing though. Easy to do ...
Planipatch® fast-setting, polymer-modified cement-based interior patching compound quickly develops high compressive strength. It can be used for skimcoating unfinished, rough-textured concrete and approved wood underlayments and for filling minor voids, cracks, and holes in concrete and wood underlayments.
We commonly carry out Concrete Cube and Concrete Core compressive strength testing as well as mechanical, physical and chemical testing of natural and recycled aggregates to ensure they are fit for purpose.
Universal testing machines for todays high capacity applications require sturdy load frames along with computer data acquisition and control capabilities. The fully-accessorized UNITED SHFM Series Testers include a complement of support hardware and accessories to immediately commence testing for tensile or compressive strength as well as bend and flex testing. Load cells are stan... Read more.... More Product Announcements from United Testing Systems, Inc. ...
1-محسن حاجی حسنی, 2015, Application of several non?linear prediction tools for estimating uniaxial compressive strength of granitic rocks and comparison of their performances,Engineering with Computers ...
Reddy, T.*, Rot-Nikcevic, I.*, Downing, K.J., Belliveau, A.C., Hallgrímsson, B., Hall, B.K., and Kablar, B. (2006) Myf5-/-: MyoD-/- amyogenic fetuses reveal the importance of early contraction and static loading by striated muscle in mouse skeletogenesis. Development genes and evolution. 216: 1-9. Pubmed ...
HPLC Part: 00B-4435-U0-AX Gemini® 5 µm C18 110 Å, LC Column 50 x 30 mm, AXIA™ Packed, Ea Recomended Use: Separation of basic compounds under high pH conditions Separation Mode: Reversed Phase Solid Support: Fully Porous Organo-silica Format: AXIAL Compression USP Designation: L1
HPLC Part: 00D-4444-P0-AX Gemini® 5 µm C6-Phenyl 110 Å, LC Column 100 x 21.2 mm, AXIA™ Packed, Ea Recomended Use: Separation of aromatic, polar, or basic compounds under high pH conditions Separation Mode: Reversed Phase Solid Support: Fully Porous Organo-silica Format: AXIAL Compression USP Designation: L11
A connector for applying to the exterior of an elongated member of circular cross-section circumferentially uniform radially directed compressive forces by which to effect attachment and fluid-tight sealing thereagainst. The connector comprises an attachment fitting having formed therethrough a bore for slidably receiving the elongated member and a coaxially disposed, radially enlarged compression recess communicating therewith. A flexible annular gripping member resides in the compression recess slidably circling the elongated member. A locking hub disposed at the end of the compression recess remote from the bore has a compression face which extends into compression recess. The locking hub is longitudinally slidable relative to the attachment fitting between a disengaged position in which the elongated member is slidable relative to the gripping member and an engaged position in which the compression face bears against and deforms the gripping member to preclude sliding of the tubing relative to the
Stochastic indicators are measured from 0-100 and are known as oscillators (they move only within this controlled range). One good example would be the Relative Strength Index (RSI), which has been used to denote overbought or oversold conditions; however, these indicators fail in times of breakouts in either directions, and a stock can potentially go up infinitely in its "overbought" state or down to 0 in its "oversold" state. This indicator, and most others, are comprised of overly complex calculations, which are derived from price action and volume of a given security ...
Mathews, J. F. and Morey, D. C. D. (1971), Compressibilities of helium-nitrogen mixtures. Can. J. Chem. Eng., 49: 282-285. doi: 10.1002/cjce.5450490219 ...
Rock Compressibility is one of the topic in which we provide homework and assignment help. Assignmenthelp.net provides email based assignment help, honmework help, online tutoring in all subjects.
Efficacy of Feed Forward and Feedback Signaling for Inflations and Chest Compression Pressure During Cardiopulmonary Resuscitation in a Newborn Mannequin
Efficacy of Feed Forward and Feedback Signaling for Inflations and Chest Compression Pressure During Cardiopulmonary Resuscitation in a Newborn Mannequin
The increase in construction activities due to economic and population growth has led to the higher demand and utilization of cement. But cement production leads to the pollution of the environment. Consequently, this study examines the utilization of both ground granulated blast furnace slag (GGBFS) and corncob ash (CCA) as source materials in the production of geopolymer concrete (GPC). GGBFS was replaced by CCA in 0%, 20%, 40%, 60%, 80% and 100% respectively using Grade 30 (M30) mix design proportion. Alkaline liquids were prepared to obtain 14 molar concentrations and used to activate the source materials. Slump, density and compressive strength of GPC were determined and compared with Portland cement concrete (PCC). The research findings indicate that GPC has higher compressive strength than PCC. Based on the relationship between the compressive strength and the density, a model equation is established. And the equation is used to predict the compressive strength of GPC with respect to the ...
The type IV dental stone is widely used for the fabrication of dyes and master casts for fixed and removable partial prostheses. It is typically normal to wait at least 24 hours for the casts to dry prior to beginning the laboratory procedures. The waiting time has been shown to be greatly reduced by using microwave drying. Objective: This study evaluated the influence of drying techniques at room temperature and microwave oven on the linear dimensional change, compressive strength and detail reproduction in type IV dental stones. Material and Methods: Three type IV dental stone brands were selected; Elite Rock, Shera Premium and Durone IV. Two different drying protocols were tested in 4 groups (n=10); G1 - room temperature (25 +/- 4 degrees C) dried for 2 hours; G2 - room temperature dried for 24 hours; G3 - room temperature dried for 7 days and G4 - microwave oven dried at 800 W for 5 minutes and after 2 hours at room temperature. After drying, the samples were assayed for dimensional charges. ...
A series of high entropy alloys (HEAs), AlxNbTiMoV, was produced by a vacuum arc-melting method. Their microstructures and compressive mechanical behavior at room temperature were investigated. It has been found that a single solid-solution phase with a body-centered cubic (BCC) crystal structure forms in these alloys. Among these alloys, Al0.5NbTiMoV reaches the highest yield strength (1,625 MPa), which should be attributed to the considerable solid-solution strengthening behavior. Furthermore, serration and crackling noises near the yielding point was observed in the NbTiMoV alloy, which represents the first such reported phenomenon at room temperature in HEAs.
Research Corridor has published a new research study titled "Dry Mix Mortar Market - Growth, Share, Opportunities, Competitive Analysis and Forecast, 2017 - 2025". The Dry Mix Mortar Market report studies current as well as future aspects of the Dry Mix Mortar Market based upon factors such as market dynamics, key ongoing trends and segmentation analysis. Apart from the above elements, the Dry Mix Mortar Market research report provides a 360-degree view of the Lipstick Packing industry with geographic segmentation, statistical forecast and the competitive landscape.. Browse the complete report at http://www.researchcorridor.com/dry-mix-mortar-market/. Geographically, the Dry Mix Mortar Market report comprises dedicated sections centering on the regional market revenue and trends. The Dry Mix Mortar Market has been segmented on the basis of geographic regions into North America, Europe, Asia Pacific and Rest of the World (RoW). The RoW segment consists Latin America and the Middle East & Africa. ...
Salt crystallization is one of the most powerful weathering agents that may cause a rapid change in the mechanical properties of stones, and thus limit their durability. Consequently, determining the mechanical properties of stones due to salt crystallization is important for natural building stones used in marine environmental and mild climatic conditions, which expose excessive salt crystallization cycles. In this study, multivariate regression analysis was performed for estimating the mechanical properties of travertine building stones after salt crystallization test. For this purpose, 12 travertine samples were selected and their physical and mechanical properties (density, porosity, uniaxial compressive strength, Brazilian tensile strength, and P-wave velocity) were determined. Then salt crystallization test was carried out at sodium sulfate solution (Na2SO4) up to 50 cycles and, after every 5 cycles, the uniaxial compressive strength, Brazilian tensile strength and P-wave velocity of the
Abstract]. Chondrocytes are mechanosensitve cells that respond to changes in the environment to maintain articular cartilage homeostasis. One potential mechanosensitive feedback system involves enzymes and signaling mechanisms that balance the reducing and oxidizing (i.e., "redox") conditions of the cell.. We found that cyclic compressive loading of healthy bovine cartilage alters the endogenous cartilage antioxidant network. Higher compressive stress (40% strain) increased glutathione oxidation and caused a reduction in the expression of the rate-limiting enzymes for glutathione synthesis. Higher stress also increased the expression of the mitochondrial antioxidant SOD2 while decreasing the cytosolic isoform SOD1, consistent with mitochondrial-derived ROS production at higher loads. Moderate compressive stress (15% strain) caused glutathione oxidation as well, but it also increased total glutathione content and upregulated SOD1 gene expression. Pro-oxidant conditioning of cartilage using tBHP ...
Both mechanical load and elevated levels of proinflammatory cytokines have been associated with the risk for developing osteoarthritis (OA), yet the potential interaction of these mechanical and biological factors is not well understood. The purpose of this study was to evaluate the response of chondrocytes to the effects of dynamic unconfined compression, TNF-α, and the simultaneous effects of dynamic unconfined compression and TNF-α. The response to these three treatments was markedly different and, taken together, the response in the gene expression of chondrocytes to the different treatment conditions suggest a complex interaction between structure, biology, and mechanical loading.. ...
The activities of this research team involve several areas. The first area is diagnostics of materials and structural analysis. This part of the team deals with the diagnostics of insulating systems of electrical machines and devices from the point of view of their properties relating to the measurement of insulation resistance, short-circuit factors, capacity and partial discharges. Apart from the electrical tests, mechanical tests are performed, for example, the measurement of tensile strength, compression strength and bending strength. Of all the structural analysis methods employed in this research workplace, it is necessary to mention thermal-mechanical analysis, dynamic-mechanical analysis, thermogravimetry, differential scanning calorimetry and infra-red spectroscopy with the Fourier transformation.. The second area of interest involves the diagnostics of electronics components, printed-circuit boards and linkage structures. In this area, the microscopy laboratory is frequently exploited, ...
... Unconfined gas permeable membranes situated within mixed reactors are currently being evaluated as a viable technology for gas transfer. The use of sealed hollow fiber membranes that are pressurized with pure oxygen provides rapid and effective gas transfer without bubbles. The ability for gas transfer without bubble formation makes this technology especially well suited for environments where the gas stripping of VOCs (volatile organic compounds) is of concern. The kinetics of gas transfer are fast and well defined since the interfacial area is known and the driving force for transfer is large. In this paper, mass transfer correlations are presented for unconfined membranes which allow the performance of membrane aerators to be compared with other gas transfer technologies.
Close To You sells compression hose for vascular problems, swelling, edema, tired legs, and varicose veins. They are sold as knee hi, thigh hi, and waist hi / pantyhose styles. 15/20 mmHg, 20/30 mmHg, and 30/40 mmHg compression strengths. Compression socks will also help with your sports needs. From basketball, running, walking, hiking, Cross-Fit, workouts, and various other outdoor activies.
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Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Material i Medicin) ...
A large number of scaled-down tunnel experiments were undertaken to investigate the response of unsupported walls to an increased stress field. The experiments were undertaken in 200 mm diameter tunnels that were drilled into intact rock blocks of sandstone and granite ranging in strength from moderately strong to very strong. The tunnels were loaded by a servo-controlled, 450 tonne capacity INSTRON compression testing machine. As the ratio of intact rock strength to induced stress decreased, the unsupported tunnel walls became increasingly unstable. Critical ratios of compressive strength to induced stress were determined for critical instability stages such as tunnel spalling and also pillar crushing adjacent to the tunnels. The physical models have been simulated using three-dimensional finite element modelling. The values of the critical ratios correlate well with underground observations of full scale tunnels with similar Uniaxial Compressive Strength materials. Dynamic ejection velocities ...
Carton and boxes are widely used in different industries and during the transportation, the cartons and the boxes should bear the compression force and keep intact. Hence before using, the carton should be tested with compression testing instrument.. Labthink introduces the innovative testing instrument, PARAM XYD-15K Box Compression Tester is designed to measure the compressing resistance, shape change and stacking capability of cartons, beehive crates, plastic tanks (for edible oil and mineral water), paper tanks, paper cases and IBC tanks and other packages.. About Labthink:. Labthink, focusing on the laboratory testing instruments R&D and production and laboratory IT services, is dedicated to provide professional quality control solutions for customers in packaging, food, pharmaceutical, medical, daily chemistry, printing, adhesive, automotive, petrochemistry, bioscience, construction, new energy and other industries. Labthink is an international enterprise headquartered in Jinan, China with ...
Chemie-Ingenieur-Technik 73 (2001) S. 755 und in: Proceedings of 3rd European Conference of Chemical Engineering, Nürnberg 2001. [CD-ROM ...
The effect of grain crushing during one dimensional compression and triaxial compression tests is investigated in a double-porosity granular material using the Discrete Element Method (DEM). Experimental tests results from the literature on a porous crushable soil (pumice sand) were simulated in 3-D using a large number of particles and without the use of agglomerates. The numerical simulations show the importance of incorporating internal porosity as a material characteristic. The variation of internal porosity with particle dimensions is of fundamental importance while describing the mechanical behavior of the material. The contact model parameters were calibrated using low confinement triaxial compression experimental tests while the particle failure criteria was calibrated using high pressure one dimensional compression tests. Particle strength size effect was assumed equal to that observed in other porous geomaterials and ultimately derived from the variation of internal porosity. The good ...
The investigation was concerned with the study of the mechanisms of crack propagation in plain concrete when subjected to static, high sustained or high repeated compressive loads. The objectives were: (1) to study the nature of progressive crack growth of concrete under such loading conditions, and (2) to formulate a conceptual model which describes crack extension at a given stress, as well as the manner in which failure of concrete takes place. The first objective was accomplished by developing a technique which allowed continued observation of progressive crack growth on the surface of plain concrete prisms under load. Strains were recorded throughout the life of each specimen. The effect of the load history, the maximum stress level, and the surface condition of the specimen on the nature of crack growth were investigated. On the basis of the study of surface crack growth and the examination of failed specimens it was possible to formulate a conceptual model which explains the failure ...
Cells of the meniscus are exposed to a wide range of time-varying mechanical stimuli that may regulate their metabolic activity in vivo. In this study, the biological response of the meniscus to compressive stimuli was evaluated in vitro, using a well-controlled explant culture system. Gene expression for relevant extracellular matrix proteins was quantified using real-time RT-PCR following a 24 h period of applied static (0.1 MPa compressive stress) or dynamic compression (0.08-0.16 MPa). Static and dynamic compression were found to differentially regulate mRNA levels for specific proteins of the extracellular matrix. Decreased mRNA levels were observed for decorin ( [similar to] 2.1 fold-difference) and type II collagen ( [similar to] 4.0 fold-difference) following 24 h of dynamic compression. Decorin mRNA levels also decreased following static compression ( [similar to] 4.5 fold-difference), as did mRNA levels for both types I ( [similar to] 3.3 fold-difference) and II collagen ( [similar to] ...
compressive strength values are measured after moist curing for two days at 20° C., and then moist curing for 2 days at 90° C. on cylindrical test samples having a diameter of 7 cm and a height of 14 cm; the force applied to the sample is increased at a rate of 3.85 kN/sec during testing; flexural strengths are measured after moist curing as described for compressive strength values on prism-shaped test samples measuring 4×4×16 cm supported at two points, force being applied in the middle; the force applied to the sample is increased at a rate of 0.05 kN/sec during testing; [0145] percentages, unless otherwise specified, are by weight; [0146] surface areas of materials are measured by: [0147] the BET method using a Beckman Coulter SA 3100 apparatus with nitrogen as the adsorbed gas; or [0148] Blaine surface areas are measured at 20° C. at a relative humidity not exceeding 65% using a Blaine Euromatest Sintco apparatus in accordance with European Standard EN 196-6; [0149] prior to the ...
A novel masonry material containing postindustrial cellulose, bentonite clay, and small amounts of other additives (e.g., antifungal, desiccant and water proofing agents) was made and characterized. The overall mechanical properties of the composite material are controlled and tailored by varying the ratio of the primary constituents (postindustrial cellulose and bentonite clay). This grade of cellulose is no longer suitable for use in the manufacture of recycled paper products and, as such, it is considered a waste product. The described process repurposes this cellulose waste as a component in a structural element that can be worked using standard woodworking tools. The materials compressive strength ranges from approximately 338 psi (2.33 MPa) at low bentonite ratios (less than 50 % by mass) to approximately 1,015 psi (7.01 MPa) at higher bentonite ratios (greater than 60 % by mass). The higher bentonite ratio, Ratio B, has a compressive strength similar to that of a Class 2 burnt brick but ...
It seems that I cant let go of the Mortar topic, but Ive had this post in my mind for quite a long time. I think that it has come to the right time to publish it. If youre having trouble figuring out what I mean by this headline, let me explain it to you. The Mortar is the only building in Clash of Clans have that slow fire rate (not only the fire rate but also how long the projectile needs before it impacts). In this post, I will give you some inside tips on how you can play a trick on the Mortars by timing the deployment of your Troops correctly. By troops, I mean troops that are afraid of the Mortar (Archers, Goblins, and Barbarians) of course ...
Mechanical CompressionAn engines mechanical compression ratio can be defined as the ratio of the volume above the piston at bottom dead center (BDC) compared to the volume at top dead center (TDC). The ignition coil on a Harley Davidson motorcycle is an essential component of the ignition system. engine and chassis of Harley-Davidsons long-running OHV Big Twin. We offer this and much more, so check out our website for more details!. High Output Revolution X™ 750 Engine. Clymer Harley-Davidson FXD Evolution 1991-1998 repair manual is written specifically for the do-it-yourself enthusiast. Whether your interest is Cafe Racers, Bobbers, Choppers, Brats, Trackers, Scramblers or you just want something a little different for your current ride, you are sure to find the parts you need right here. By 1971, carmakers began reducing compression in many engines in order to meet upcoming emissions requirements and to use unleaded fuel. A very common procedure for European cars is a running compression ...
The water reducing properties of solutions containing small amounts of sodium n-dodecylbenzene-sulfonate and acetone are studied. Water reductions up to 28% are obtained in mortars composed by 30% cement and 70% graded sand. Sorptivity coefficients vary between 78 and 380 g m-2 s-1 2 (no admixture: 744 g m-2 s-1 2). Slump loss rates of mortars with admixture are similar to those of the admixturefree ones. Compressive strength after 28 days is roughly 50% higher for the mortars with admixture. Surface tension measurements are used to explain the unexpected efficiency of these solutions. © 1994 ...
Authors: Zaczyk, Marcin Article Type: Research Article Abstract: BACKGROUND/OBJECTIVE: We present a description of an experiment in which the parameters describing the quality of the mandrel embedding an implant into a bone were determined. A method was developed that allows, from outside a living organism, the strength of the mandrel of the implant in the bone tissue to be determined. Using the proposed technique, we investigated how the mechanical properties of the bone affect the quality of the implant mandrel embedding in the bone tissue. MATERIALS AND METHODS: As part of the research work, we conducted 15 compression tests on previously prepared samples that reflected an …uncemented endoprosthesis embedding in the proximal base of a femur bone. RESULTS: The results of the research showed that the load applied is dispersed between the mandrel and the bone tissue. The mechanical stability of the embedding affects the mechanical properties of the bone. The experiment revealed the nature of ...
The Palmyride Fold Belt is an aulacogen within the Arabian plate linked to the Levantine continental margin, which contains ,10 km of Phanerozoic sediments. Inversion of this Mesozoic basin began during Late Cretaceous time, although most deformation was clearly post-Oligocene. Recent field mapping shows that almost all the structures have resulted from a phase of northwest-southeast compression followed by major dextral transpression. Early northwest-southeast compression resulted in northeast-southwest-aligned fold axes in the central and southeast Palmyrides, many of which were subsequently rotated by progressive dextral simple shear during Neogene to Recent time. The north-south-aligned sinistral Dead Sea fault is the major wrench fault aligned at 45° to the maximum compressive stress. The conjugate east-west-striking dextral Jhar fault and the northwest-southeast-aligned Bishri fault have accommodated limited dextral shear and clockwise rotation of northeast-southwest-aligned folds (Jebels ...
D4832 - 16 Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders , backfill, CLSM, compressive strength, construction control, mix design, quality control, soil stabilization,,
Amino Sulfonic Acid-based Superplasticizer is a new generation of high-performance admixture developed at hone and abroad in recent years, with properties of low dosage, high water-reducing, high concrete strength enhancing, low-alkali, low shrinkage, high-slump, and green environmental protection. As no pollution in the production process which meets the requirement of green environmental protection, it has been taken as key projects in developed countries. It has strong dispersion to cement particles, high-water reducing, and low air-entraining. It remarkably enhances concrete compressive strength. It may be applicable in formulating high-strength, high-fluidity, and high-performance concrete. As a result of improving the fluidity of fresh concrete, amino sulfonic acid-based superplasticizer not only shortens the mould replacement cycle and construction process, but also reduces cement consumption. It becomes a high-efficient concrete admixture used in concrete of cast-in-site, precast, ...
A controlled-release pharmaceutical unit dosage form is provided comprising a gelatin capsule enclosing a solid matrix formed by the cation-assisted gellation of a liquid fill incorporating a vegetable gum and a pharmaceutically-active compound, as well as methods for the preparation thereof.
Tempering of martensite under simultaneous compressive stress has been studied within the temperature range of 20-400 deg C. Resistive heating was utilised to obtain rapid heating and cooling cycles of a few seconds. Material was obtained from a medium carbon pearlitic railway wheel steel, quench hardened to obtain martensitic structure. Above approx 150 deg C dilatation effects were observed below the global yielding point of the material. Microstraining around dislocations in the body centred tetragonal crystallographic structure or viscous flow at higher temperatures was a probable explanation to this material behaviour. Hence, external stress may have an important influence on the tempering progression of martensitic steel. The trials also showed that tempering of martensite progresses fast, is near instantaneous and is independent of the presence of external stress or not.
In the light of the identified distribution of the disk compression forces, it appeared appropriate to classify the various shovelling tasks as either the routine or the special case. In the routine case, a maximum disk compression force of 3.5 kN and a stress duration of 2 s per shovelling cycle may be assumed. In the exceptional, special case, which applies at a very high working pace, as experienced for example by concrete floor layers assistants during exclusive shovelling of sand, the maximum compression force is 6.25 kN for a stress duration of 1.5 s per shovelling cycle. The shovel load in all cases is approximately 8 kg. In order for the daily dose caused by shovelling work to be determined, the quantity of bulk material shovelled each day, i.e. the work completed each day, such as the number of cubic metres of concrete floor laid or the number of batches produced, must be obtained. This permits more reliable calculation of the quantity of bulk material shovelled, and ultimately the ...
The study investigated ingress of Cl- ions and their effects on the compressive strength development of a pozzolana based cement. The cement was made by blending Ordinary Portland Cement (OPC) with selected calcined clays. X-Ray Fluorescence (XRF), Atomic Absorption Spectroscopy (AAS) and flame photometry chemical analysis were carried out as a preliminary test to determine the chemical composition of the sampled clays. It was found that only one of the sampled clays had a sum of Al2O3, SiO2 and Fe2O3 above 70 percent. Sampled clays were activated at a temperature of 700 0C for one and two hours separately and also at 800 0C for one hour. Pozzolanicity test was carried out on the sampled clays using the conductometric method. Clays calcined at 800 0C for one hour exhibited the highest level of pozzolanicity. The calcined clay at 800 0C for one hour was blended with OPC at replacement levels of 25, 30, 35, 40, 45 and 50 percent by weight of the clay to make test cements labeled PCC25, PCC30, ...
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TRAIL, DR5 and caspase 3-dependent apoptosis in vessels of diseased human temporomandibular joint disc. An immunohistochemical study
This research aimed to determine the elastic modulus of resin-based dental composite restoratives using the microindentation test method. Results were then compared with those obtained with the ISO three-point bending test method. Five materials from the same manufacturer (3M ESPE) were selected for the study. They included microfill (A110), minifill (Z100 and Filtek Z250), poly-acid modified (F2000), and flowable (Filtek Flowable [FF]) composites. The indentation moduli of the composites were determined using a custom-designed microindentation test set up after conditioning in water at 37°C for 1 week and 1 month. The indentation test was carried out at peak load of 10 N and Oliver & Pharrs method was used to determine the maximum projected contact area. Data was analyzed using ANOVA/post-hoc Scheffes test at significance level 0.05 and Pearsons correlation at significance level 0.01. The mean indentation modulus ranged from 5.80 to 15.64 GPa and 5.71 to 15.35 GPa at 1 week and 1 month, ...
I have this too and finally found the correlation to another condition I have, sleep apnea. I found an article about bilateral leg edema, hypertension, and sleep apnea.I researched under sleep apnea: leg edema and found several articles. I am hoping my condition dissipates when I get my CPAP next week. I have severe obstructive sleep apnea.Two cardiologists have confirmed I dont have Congestive Heart Failure. That is one condition which can cause leg edema too. Another one is chronic venous insufficiency. Both of these have pitting edema. Sometimes old age can cause the venous insufficiency especially if you have varicous veins. Ask a doctor whether compression hose would be appropriate treatment in your situation. And youll need to be fitted for the compression strength and length. Dont just purchase them without knowing this information. It does work. Truform Compression Hose can be purchased at WalMart is realitively inexpensive compared to some of the other brands out there. Ive done ...
Finite Element Method (FEM) is a numerical technique of obtaining solutions to boundary value problems. The practical application of Finite Element Method is called as Finite Element Analysis (FEA). FEA is the computational tool for performing engineering analysis. Biomechanical analysis involves dealing with the mechanical aspects of the biological systems. FEM techniques can be used to study the engineering analysis of different biological systems. Femur bone is the longest and strongest bone of the human body. It undergoes mostly compressive loading. It exhibits anisotropy, indicating that the strength is different in different directions when a force is applied. It is hyperelastic in nature. It has two anatomical structures namely cortical bone tissue and cancellous bone tissue. The cortical is dense and tightly packed. The cancellous is porous. Cortical section is superior in mechanical properties compared to cancellous section. Cortical and cancellous are formed with collagen fibers. Upon ...
In vivo rodent tail models are becoming more widely used for exploring the role of mechanical loading on the initiation and progression of intervertebral disc degeneration. Historically, finite element models (FEMs) have been useful for predicting disc mechanics in humans. However, differences in geometry and tissue properties may limit the predictive utility of these models for rodent discs. Clearly, models that are specific for rodent tail discs and accurately simulate the discs transient mechanical behavior would serve as important tools for clarifying disc mechanics in these animal models. An FEM was developed based on the structure, geometry, and scale of the mouse tail disc. Importantly, two sources of time-dependent mechanical behavior were incorporated: viscoelasticity of the matrix, and fluid permeation. In addition, a novel strain-dependent swelling pressure was implemented through the introduction of a dilatational stress in nuclear elements. The model was then validated against data ...

ASU Electronic Theses and Dissertations | ASU Digital RepositoryASU Electronic Theses and Dissertations | ASU Digital Repository

Composite materials are increasingly being used in aircraft, automobiles, and other applications due to their high strength to ... Bayesian Framework for Sparse Vector Recovery and Parameter Bounds with Application to Compressive Sensing ...
more infohttps://repository.asu.edu/collections/7?sort=score+desc%2Citem_label_sort+asc&per_page=20&cont=Papandreou-Suppappola%2C+Antonia&mime=application%2Fpdf

Compressive Strength Testing of PlasticsCompressive Strength Testing of Plastics

This describes compressive property tests for plastics and gives average values of compressive strength and compressive modulus ... Compressive Strength Testing of Plastics. The compressive strength of a material is the force per unit area that it can ... Typical Compressive Yield Strength and Compressive Modulus of Polymers. (Wide variations exist between specific grades.) ... The table below lists average compressive strengths and compressive moduli for some filled and unfilled polymers. ...
more infohttp://www.matweb.com/reference/compressivestrength.aspx

Influence of Pore Structure on Compressive Strength of Cement MortarInfluence of Pore Structure on Compressive Strength of Cement Mortar

Finally, the extended Bhattacharjee model was built to examine the relationship between compressive strength and pore structure ... is considered to account for the influence of pore structure on the compressive strength of concrete: where is mean diameter, ... In addition, uniaxial compressive strength was tested and the strength-pore structure relationship of cement mortar has been ... have proposed a relationship between compressive strength and hydration degree, mean diameter, and porosity as follows: where ...
more infohttps://www.hindawi.com/journals/tswj/2014/247058/

CDC - Mining - Effects of Specimen Age on the Uniaxial Compressive Strength - NIOSHCDC - Mining - Effects of Specimen Age on the Uniaxial Compressive Strength - NIOSH

The uniaxial compressive strength (UCS) is the most fundamental measurement used in geotechnical rock characterization for mine ... Mining Publication: Effects of Specimen Age on the Uniaxial Compressive Strength and Moisture Content of Weak Coal Measure ... Correlation of Sonic Travel Time to the Uniaxial Compressive Strength of U.S. Coal Measure Rocks ... Keywords: Humidity Uniaxial compressive tests Weak rock. This page is archived for historical purposes and is no longer being ...
more infohttps://www.cdc.gov/niosh/mining/works/coversheet1624.html

Dissertations.se: COMPRESSIVE STRENGTHDissertations.se: COMPRESSIVE STRENGTH

... about COMPRESSIVE STRENGTH. Search and download thousands of Swedish university dissertations. Full text. Free. ... compressive strength. Showing result 1 - 5 of 109 swedish dissertations containing the words compressive strength. ... compressive strength; diametral tensile strength; flexural strength; elastic modulus; Poissons ratio; fatigue; Teknisk fysik ... Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Shotcrete; rock; granite; bond strength; compressive strength; ...
more infohttps://www.dissertations.se/about/compressive+strength/

Patente US4226946 - Polyethylene blend foams having improved compressive strength - Google PatentesPatente US4226946 - Polyethylene blend foams having improved compressive strength - Google Patentes

Low density foams from polyethylene blends having substantially closed cell structure and improved compressive strength are ... The term "average compressive strength" as used herein means an average of compressive strength values, expressed in pounds per ... The term "compressive strength" as used herein means the property of foam articles as determined by the test procedure ... 3. The method according to claim 2 wherein the blend foams have compressive strength at 10% deformation of from about 7 to ...
more infohttp://www.google.es/patents/US4226946?dq=flatulence

Compressive strength - WikipediaCompressive strength - Wikipedia

... compressive strength, and shear strength can be analyzed independently. Some materials fracture at their compressive strength ... tend to have higher tensile strengths than compressive strengths. Metals tend to have tensile and compressive strengths that ... Compressive strength is a key value for design of structures. Compressive strength is often measured on a universal testing ... Compressive strength is measured on materials, components, and structures. By definition, the ultimate compressive strength of ...
more infohttps://en.wikipedia.org/wiki/Compressive_strength

Compressive Strength and Characterization of Failure Modes for Polymer ConcreteCompressive Strength and Characterization of Failure Modes for Polymer Concrete

The compressive strength varied from 38 to 85 MPa depending on the PC system. The finer sand systems showed higher compressive ... p>The effect of aggregate type, polymer content and specimen dimensions on the compressive strength and failure modes of a ... strength. The specimens tested failed in shear and/or central splitting and a method to quantify the failure modes has been ... Compressive Strength and Characterization of Failure Modes for Polymer Concrete. < ...
more infohttps://cedb.asce.org/CEDBsearch/record.jsp?dockey=0076409

A Study on Occupancy and Compressive Strength of Concrete with Produced Injection MethodA Study on Occupancy and Compressive Strength of Concrete with Produced Injection Method

... Cevdet Emin Ekinci and Omer Kelesoglu ... Cevdet Emin Ekinci and Omer Kelesoglu, "A Study on Occupancy and Compressive Strength of Concrete with Produced Injection ...
more infohttps://www.hindawi.com/journals/amse/2014/241613/cta/

Neural Tree for Estimating the Uniaxial Compressive Strength of Rock Materials | SpringerLinkNeural Tree for Estimating the Uniaxial Compressive Strength of Rock Materials | SpringerLink

... is the most important parameter that quantifies the rock strength. However, determination of the UCS in laboratory is very ... Uniaxial Compressive Strength (UCS) is the most important parameter that quantifies the rock strength. However, determination ... Mishra, D.A., Basu, A.: Use of the block punch test to predict the compressive and tensile strengths of rocks. Int. J. Rock ... Uniaxial compressive strength Index tests Rock materials Heterogeneous flexible neural tree Feature analysis ...
more infohttps://link.springer.com/chapter/10.1007/978-3-319-76351-4_1

Compressive strength of extruded unfired clay masonry units - OpusCompressive strength of extruded unfired clay masonry units - Opus

Compressive strength of extruded unfired clay masonry units. Proceedings of the Institution of Civil Engineers: Construction ... The focus of this study was to investigate the properties affecting the compressive strength of these building products. Both ... The reduction in strength with increases in moisture content are similar for different material sources and these strength ... theoretical models and test results demonstrate that the clay content plays a large role in defining the compressive strength ...
more infohttp://opus.bath.ac.uk/16596/

Recycling | Free Full-Text | Compressive Strength and Leaching Behavior of Mortars with Biomass AshRecycling | Free Full-Text | Compressive Strength and Leaching Behavior of Mortars with Biomass Ash

Measurements of workability, compressive strength, and leachate properties (pH, salinity, heavy metals and calcium ion release ... analysis has been reported between the mass of calcium ions leached and the mixture composition with the compressive strength. ... Keywords: biomass ash; biofuel; compressive strength; concrete; fly ash; leaching biomass ash; biofuel; compressive strength; ... Compressive Strength and Leaching Behavior of Mortars with Biomass Ash. Gabriele Fava 1,* , Tarun R. Naik 2. ...
more infohttps://www.mdpi.com/2313-4321/3/3/46

Concrete Block Compressive Strength, Concrete Block Compressive Strength Suppliers and Manufacturers at Alibaba.comConcrete Block Compressive Strength, Concrete Block Compressive Strength Suppliers and Manufacturers at Alibaba.com

A wide variety of concrete block compressive strength options are available to you, such as tensile testing machine, strength ... Alibaba.com offers 172 concrete block compressive strength products. About 49% of these are testing equipment. ... Tags: Concrete Compressive Strength Testing Machine , Compressive Strength Testing Machine , Compressive Strength Testing ... Tags: Block Compressive Strength Testing Machine , Compressive Strength Testing Machine For Brick , View larger image ...
more infohttp://www.alibaba.com/showroom/concrete-block-compressive-strength.html

US4226946A - Polyethylene blend foams having improved compressive strength 
        - Google PatentsUS4226946A - Polyethylene blend foams having improved compressive strength - Google Patents

Low density foams from polyethylene blends having substantially closed cell structure and improved compressive strength are ... The term average compressive strength as used herein means an average of compressive strength values, expressed in pounds per ... Polyethylene blend foams having improved compressive strength EP19800100884 EP0016348B1 (en) 1979-02-22. 1980-02-22. Method of ... Polyethylene blend foams having improved compressive strength Download PDF Info. Publication number. US4226946A. US4226946A ...
more infohttps://patents.google.com/patent/US4226946?oq=flatulence

Buildings  | Free Full-Text | Optimum Compressive Strength of Hardened Sandcrete Building Blocks with Steel Chips | HTMLBuildings | Free Full-Text | Optimum Compressive Strength of Hardened Sandcrete Building Blocks with Steel Chips | HTML

This is to establish their influence on the compressive strength of sandcrete hollow blocks and solid cubes with the aim of ... Using the plotted profile, the margin of steel chips additions for the optimum compressive strength was also established. It is ... It was confirmed that the grading parameters were improved and there were significant increases in the compressive strength of ... and even Latin America where most sandcrete blocks exhibit compressive strengths far below standard requirements. Percentages ...
more infohttp://www.mdpi.com/2075-5309/3/1/205/htm

ASTM C1314 - 11a standard test method for compressive strength of masonry prisms on Environmental XPRTASTM C1314 - 11a standard test method for compressive strength of masonry prisms on Environmental XPRT

compressive strength of masonry (fmt); masonry prism; masonry prism strength; masonry specimen; specified compressive strength ... 11a standard test method for compressive strength .... ASTM C1314 - 11a standard test method for compressive strength of ... compressive strength.. This test method provides a means of evaluating compressive strength characteristics of in-place masonry ... strength of masonry, fmt, used to determine compliance with the specified compressive strength of masonry, f ′m. When this test ...
more infohttps://www.environmental-expert.com/news/astm-c1314-11a-standard-test-method-for-compressive-strength-of-masonry-prisms-273365

Factors influencing the compressive strength of an injectable calcium sulfate-hydroxyapatite cement.Factors influencing the compressive strength of an injectable calcium sulfate-hydroxyapatite cement.

... Nilsson, Malin K LU ; ... For applications in bone defects the compressive strength is important to assure support of the defect site during loading when ... For applications in bone defects the compressive strength is important to assure support of the defect site during loading when ... For applications in bone defects the compressive strength is important to assure support of the defect site during loading when ...
more infohttps://lup.lub.lu.se/search/publication/047bf8db-6a86-4d63-a2d5-e631d36e32b7

Preparation and Characterization of High Compressive Strength Geopolymeric Monoliths Using Silica WastePreparation and Characterization of High Compressive Strength Geopolymeric Monoliths Using Silica Waste

... ... The effect on the compressive strength of different proportions of the alkaline solutions was studied. Compressive strengths of ... GGBFS exhibits higher compressive strength and increased along with increase of GGBFS blaine. The compressive strengths of ... The results show that a great increase in compressive strength appears when the replacement percentage of GGBFS exceeds 30wt ...
more infohttps://www.scientific.net/MSF.569.305

4. Buckling and compressive strength of laminates with optimized fibre-steering and layer-stacking for aerospace applications -...4. Buckling and compressive strength of laminates with optimized fibre-steering and layer-stacking for aerospace applications -...

4 Buckling and compressive strength of laminates with optimized fibre-steering and layer-stacking for aerospace applications R ... Buckling and compressive strength of laminates with optimized fibre-steering and layer-stacking for aerospace applications. R. ... In effect, stress levels (i.e. applied running load/laminate thickness) are maximized subject to buckling and strength ... this means ensuring sufficient buckling stiffness whilst maintaining material strength in the presence of in-service damage. ...
more infohttps://www.oreilly.com/library/view/polymer-composites-in/9780857095237/XHTML/B9780857095237000049/B9780857095237000049.xhtml

Influence of mica on unconfined compressive strength of a cement-treated weathered granite gravelInfluence of mica on unconfined compressive strength of a cement-treated weathered granite gravel

... the unconfined compressive strength of cement-treated weathered granite gravel material. Other strength-related properties, ... Unconfined compressive strength. Table 3 provides a summary of average UCS results for seven-day and 28-day specimens. Analysis ... Comparing strength plot lines in Figures 8 and 9, it is noted that there is a substantial and steady decrease in strength of ... The objective of this paper is to investigate the influence of mica on the unconfined compressive strength (UCS) and volumetric ...
more infohttp://www.scielo.org.za/scielo.php?script=sci_arttext&pid=S1021-20192012000200008&lng=en&nrm=iso&tlng=en

Influence of mica on unconfined compressive strength of a cement-treated weathered granite gravelInfluence of mica on unconfined compressive strength of a cement-treated weathered granite gravel

... the unconfined compressive strength of cement-treated weathered granite gravel material. Other strength-related properties, ... Unconfined compressive strength. Table 3 provides a summary of average UCS results for seven-day and 28-day specimens. Analysis ... Comparing strength plot lines in Figures 8 and 9, it is noted that there is a substantial and steady decrease in strength of ... The objective of this paper is to investigate the influence of mica on the unconfined compressive strength (UCS) and volumetric ...
more infohttp://www.scielo.org.za/scielo.php?pid=S1021-20192012000200008&script=sci_arttext

US3023136A - Chipwood articles of high compressive strength and processes for producing the same 
        - Google PatentsUS3023136A - Chipwood articles of high compressive strength and processes for producing the same - Google Patents

Chipwood articles of high compressive strength and processes for producing the same Download PDF Info. Publication number. ... US3023136A 1956-12-17 1957-12-17 Chipwood articles of high compressive strength and processes for producing the same Expired - ... The use of this type of chipwood made material has so far been frustrated mainly by unsatisfactory compressive strength of the ... The result is a great increase in the compressive strength of the final product. Its three components become integral parts of ...
more infohttps://patents.google.com/patent/US3023136A/en

Selection of Influential Microfabric  Properties of Anisotropic Amphibolite  Rocks on Its Uniaxial Compressive  Strength (UCS):...Selection of Influential Microfabric Properties of Anisotropic Amphibolite Rocks on Its Uniaxial Compressive Strength (UCS):...

Finally, this approach can be easily extended to the modeling of rock strength in the absence of adequate geological ... especially anisotropic rocks it may be difficult to measure the uniaxial compressive strength UCS. However, the use of ... Selection of Influential Microfabric Properties of Anisotropic Amphibolite Rocks on Its Uniaxial Compressive Strength (UCS): A ... especially anisotropic rocks it may be difficult to measure the uniaxial compressive strength UCS. However, the use of ...
more infohttps://scirp.org/journal/paperabs.aspx?paperid=52652

Effects of dodecacalcium hepta-aluminate content on the setting time, compressive strength, alkalinity, and cytocompatibility...Effects of dodecacalcium hepta-aluminate content on the setting time, compressive strength, alkalinity, and cytocompatibility...

Effects of dodecacalcium hepta-aluminate content on the setting time, compressive strength, alkalinity, and cytocompatibility ... Aluminum Compounds; Biocompatible Materials; Calcium Compounds; Cell Survival; Cells, Cultured; Compressive Strength; Dental ... compressive strength, and alkalinity were evaluated. Cytocompatibility was assessed with cell viability tests and cell number ... compressive strength, alkalinity, and cytocompatibility of tricalcium silicate cement. J Appl Oral Sci. 2019;27:e20180247. ...
more infohttps://www.americanelements.com/research/effects-of-dodecacalcium-hepta-aluminate-content-on-the-setting-time-compressive-strength-alkalinity
  • Ultimate compressive strength is the stress required to rupture a specimen. (matweb.com)
  • The method includes procedures for cutting the test specimen (saw cutting and knife cutting), one procedure for specimen support (spring support clamp fixture), and two procedures for applying the compressive force (constant strain rate, or constant load rate). (complianceonline.com)
  • Materials such as most plastics that do not rupture can have their results reported as the compressive strength at a specific deformation such as 1%, 5%, or 10% of the test sample's original height. (matweb.com)
  • 3. The method according to claim 2 wherein the blend foams have compressive strength at 10% deformation of from about 7 to about 60 psi. (google.es)
  • others deform irreversibly, so a given amount of deformation may be considered as the limit for compressive load. (wikipedia.org)
  • Meulenkamp, F., Grima, M.A.: Application of neural networks for the prediction of the unconfined compressive strength (UCS) from Equotip hardness. (springer.com)
  • ASTM, 1992: Standard Test Method for Unconfined Compressive Strength of Intact Rock Core Specimens, American Society for Testing and Materials, Annual Book of ASTM Standards, ASTM Designation D 2938-86, vol. 04.08, pp. 390-391. (springer.com)
  • The focus of this study was to investigate the properties affecting the compressive strength of these building products. (bath.ac.uk)
  • The technologically and economically important aspect of our invention is that it is now possible to produce chipboard and chipwood molded products, which despite of a very low specific gravity and a small expense of raw material have strength properties, which come up to fairly high technical requirements. (google.com)
  • Physicochemical properties including initial setting time, compressive strength, and alkalinity were evaluated. (americanelements.com)
  • The objective of this paper is to investigate the influence of mica on the unconfined compressive strength (UCS) and volumetric changes of a cement-treated gravel material. (scielo.org.za)
  • Literature review revealed that a limited number of studies have reported the quantitative effects of mica on the unconfined compressive strength (UCS) of the cemented gravel soils that could assist in contextual assessment and deciding whether to consider stabilising micaceous gravel soils for use in base or sub-base layers or not. (scielo.org.za)
  • This is to establish their influence on the compressive strength of sandcrete hollow blocks and solid cubes with the aim of specifying the range percent of steel chips for the sandcrete optimum compressive strength value. (mdpi.com)
  • The influence of the mix proportion between GGBFS and FA on the strength and reaction products was investigated. (scientific.net)
  • In a study on the influence of decomposed mica schist on compaction and strength of major soil groups in Ghana, Gogo (1984) found that the presence of mica at about 13.5% contributed to the relatively low compaction densities and the high sensitivity to moisture changes. (scielo.org.za)
  • It particularly pertains to improvement in processes whereby are obtained foams having substantially closed-cell structure and improved compressive strength. (google.es)
  • Moreover, a multiple regression analysis has been reported between the mass of calcium ions leached and the mixture composition with the compressive strength. (mdpi.com)
  • Factors influencing the compressive strength of an injectable calcium sulfate-hydroxyapatite cement. (lu.se)
  • North American plastics manufacturers generally report compressive yield strength , the stress measured at the point of permanent yield, zero slope, on the stress-strain curve. (matweb.com)
  • positive strain characterises an object under tension load which tends to lengthen it, and a compressive stress that shortens an object gives negative strain. (wikipedia.org)
  • A stress-strain curve is plotted by the instrument and would look similar to the following: The compressive strength of the material would correspond to the stress at the red point shown on the curve. (wikipedia.org)
  • This is particularly important for developing countries in sub-Saharan Africa, and even Latin America where most sandcrete blocks exhibit compressive strengths far below standard requirements. (mdpi.com)
  • It was confirmed that the grading parameters were improved and there were significant increases in the compressive strength of the blocks and cube samples. (mdpi.com)
  • A core also allows for the insertion of steel reinforcement, tying individual blocks together in the assembly, with the goal of greatly increased strength. (wikipedia.org)
  • This test method provides a means of verifying that masonry materials used in construction result in masonry that meets the specified compressive strength. (environmental-expert.com)
  • This test method provides a means of evaluating compressive strength characteristics of in-place masonry construction through testing of prisms obtained from that construction when sampled in accordance with Practice C1532. (environmental-expert.com)
  • If this test method is used as a guideline for performing research to determine the effects of various prism construction or test parameters on the compressive strength of masonry, deviations from this test method shall be reported. (environmental-expert.com)
  • Such research prisms shall not be used to verify compliance with a specified compressive strength of masonry. (environmental-expert.com)
  • It is a well-known fact that porosity is one of the key parameters which directly affect the strength and durability of cement-based materials [ 6 , 7 ]. (hindawi.com)
  • Gokceoglu, C., Zorlu, K., Ceryanc, S., Nefeslioglu, H.A.: A comparative study on indirect determination of degree of weathering of granites from some physical and strength parameters by two soft computing techniques. (springer.com)
  • It is designed to test the compressive strength of standard two-inch cement cubes in exact compliance with API Spec 10A. (chandlereng.com)
  • Using the plotted profile, the margin of steel chips additions for the optimum compressive strength was also established. (mdpi.com)
  • As for the synthesis of geopolymeric monoliths, four different GGBFS content(10wt%, 20wt%, 30wt%, 40wt%) and three types of GGBFS(GGBFS-1(blaine 4,000cm2/g), GGBFS-2(6,000cm2/g), GGBFS-3(8,000cm2/g)) are investigated to obtain the optimum synthesis condition based on the high compressive strength. (scientific.net)
  • As we all know, a lower porosity in concretes with sufficient binding material content leads to higher strength concretes [ 8 - 12 ]. (hindawi.com)
  • Both theoretical models and test results demonstrate that the clay content plays a large role in defining the compressive strength of these materials. (bath.ac.uk)
  • 154-459) This invention concerns a new and improved method of making chipwood structures, more particularly structures of the chipboard type, which are especially light in weight and at the same time have a high compressive strength. (google.com)
  • Performance analysis of magnesium phosphate cement providing high early compressive strength. (ademeba.com.mx)
  • Compressive strength is a key value for design of structures. (wikipedia.org)
  • Compressive strength is measured on materials, components, and structures. (wikipedia.org)
  • The results show that a great increase in compressive strength appears when the replacement percentage of GGBFS exceeds 30wt. (scientific.net)
  • Weinert (1980) suggests that soils containing more than 10% of mica, especially muscovite, should be avoided for use in pavement layers, whereas Mitchell et al (1975) recommend that, where materials are adjudged to be very micaceous, the acceptable plasticity limits should be lowered by 33% besides meeting the strength specifications. (scielo.org.za)
  • However, it is well known that the strengths of at least some rocks can change during the time between when the core first comes up out of the hole and when it is prepared and tested in the lab. (cdc.gov)
  • Finally, the extended Bhattacharjee model was built to examine the relationship between compressive strength and pore structure. (hindawi.com)
  • Compressive strengths are usually reported in relationship to a specific technical standard. (wikipedia.org)
  • In effect, stress levels (i.e. applied running load/laminate thickness) are maximized subject to buckling and strength requirements. (oreilly.com)
  • For applications in bone defects the compressive strength is important to assure support of the defect site during loading when the patient is weight bearing. (lu.se)
  • By definition, the ultimate compressive strength of a material is that value of uniaxial compressive stress reached when the material fails completely. (wikipedia.org)
  • The term "compressive strength" as used herein means the property of foam articles as determined by the test procedure described in ASTM D-3575-77, expressed in pounds per square inch (psi). (google.es)
  • The compressive strength is usually obtained experimentally by means of a compressive test. (wikipedia.org)
  • For thin laminates subject to compression, this means ensuring sufficient buckling stiffness whilst maintaining material strength in the presence of in-service damage. (oreilly.com)
  • Compressive Strength testers are used to determine the compressive strength development, gel strength development and elastic moduli of oil well cement under simulated downhole conditions. (chandlereng.com)