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Literatura académica sobre el tema "Compressive modulus"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 8 de febrero de 2022

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Artículos de revistas sobre el tema "Compressive modulus"

1

Saud, Abdullah F., Hakim S. Abdelgader y Ali S. El-Baden. "Compressive and Tensile Strength of Two-Stage Concrete". Advanced Materials Research 893 (febrero de 2014): 585–92. http://dx.doi.org/10.4028/www.scientific.net/amr.893.585.

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An experimental investigation was conducted to evaluate the compressive, tensile strength and modulus of elasticity of two-stage concrete (TSC) at different water-to-cement ratios. The primary objectives were to measure the elastic modulus, compressive strength and splitting tensile strength of TSC and to determine if there is a quantifiable relationship between compressive and tensile strength. Behavior of TSC in compression has been well documented, but there are little published data on its behavior in tension and modulus of elasticity. This paper presents the experimental results of preplaced, crushed granite aggregate concreted with five different mortar mixture proportions. A total of 48 concrete cylinders were tested in unconfined compression modulus of elasticity and splitting tension at 28 and 90 days. It was found that the modulus of elasticity and splitting tensile strength of two-stage concrete is equivalent or higher than that of conventional concrete at the same compressive strength. Splitting tensile strength can be conservatively estimated using the ACI equation for conventional concrete.

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2

Lu, Jie Qun, Yuan Tian, Jia Geng Chen, Chen Yu Zhu, Fu Yuan Zeng, Jin Cheng Yang y Wei Wang. "Experimental Study on CFRP-PVC Confined RAC under Axial Compression". Solid State Phenomena 294 (julio de 2019): 143–49. http://dx.doi.org/10.4028/www.scientific.net/ssp.294.143.

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Compared with natural aggregate concrete (NAC), the cylinder compressive strength and elastic modulus of Recycled aggregate concrete (RAC) are decreased, but the brittleness is increased. The axial compression performance of RAC can be improved by external confinement. In this paper, the effects of Polyvinyl chloride (PVC) pipe confinement and composite confinement of PVC pipe and Carbon Fiber Reinforced Polymer (CFRP) on the axial compression performance of RAC were investigated. The results showed that with the increase of the replacement rate of recycled coarse aggregate, the cylinder compressive strength, peak strain and elastic modulus of RAC were decreased; PVC pipe confinement could significantly improve the cylinder compressive strength, peak strain and elastic modulus of RAC; the CFRP could further improve the cylinder compressive strength and elastic modulus of PVC-RAC to a certain extent, and could significantly enhance the peak strain of PVC-RAC. PVC pipe and CFRP-PVC pipe confinement could improve the axial compression performance of RAC more effectively than NAC. Consequently, PVC pipe and CFRP-PVC pipe confinement could reduce the influence of recycled aggregate (RA) quality on variability of RAC axial compression performance.

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3

Mantilla, J. N. R., Diego N. Miranda, Jamile Salim Fuina y E. V. M. Carrasco. "Mechanical Characteristics of Pavers with Iron Ore Tailings". Applied Mechanics and Materials 864 (abril de 2017): 330–35. http://dx.doi.org/10.4028/www.scientific.net/amm.864.330.

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The objective of this study is to evaluate experimentally the mechanical compressive strength and static modulus of elasticity of concrete pavers for floors made with iron ore tailings as aggregate concrete. Pavers were manufactured with four different concrete mixtures (cement, natural sand, industrial sand, iron ore tailings, crushed stone), and performed simple compression tests to determine the compressive strength and modulus of elasticity. The pavers manufactured with those concrete mixtures showed greater strength specified by the Brazilian standard. It was possible to find a correlation between modulus of elasticity and compressive strength.

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4

Wang, Ping, Hao Xu, Rong Chen, Jingmang Xu y Xiaohui Zeng. "Experimental Research on Compression Properties of Cement Asphalt Mortar due to Drying and Wetting Cycle". Advances in Materials Science and Engineering 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/769248.

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Uniaxial compression test of cement asphalt (CA) mortar specimens, due to drying and wetting cycle of 0, 2, 4 and 8 times, is carried out by using the electronic universal test machine, with the strain rate ranging from 1 × 10−5 s−1to 1 × 10−2 s−1. The effects of strain rate and drying and wetting cycle time on the compressive strength, elasticity modulus, and stress-strain full curve are investigated. Experimental results show that the strain-stress full curve of CA mortar is affected obviously by strain rate and drying and wetting cycle time. The compressive strength and elasticity modulus increase with the strain rate under the same drying and wetting cycle time. The compressive strength and elasticity modulus decrease with the increase of drying and wetting cycle time in the same strain rate. The lower the strain rate is, the greater the compressive strength and elasticity modulus of CA mortar decrease. When the strain rate is 1 × 10−5 s−1and drying and wetting cycle time is 8, the largest reduction of average compressive strength of CA mortar is 40.48%, and the largest reduction of elasticity modulus of CA mortar is 35.51%, and the influence of drying and wetting cycle on the compressive strength of CA mortar is greater than its influence on the elasticity modulus.

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5

Fartini, M. S., M. S. Abdul Majid, Mohd Afendi, R. Daud y Azizul Mohamad. "Effect of Nano-Clay and their Dispersion Techniques on Compressive Properties of Unsaturated Polyester Resin". Applied Mechanics and Materials 554 (junio de 2014): 27–31. http://dx.doi.org/10.4028/www.scientific.net/amm.554.27.

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This paper aims to understand the relationship between processing parameters and compressive properties of nanoclay filled polyester resin (dispersion method and wt% of nanoclay particles). Unsaturated polyester resin with 0-5 wt% nanoclay content was prepared by hand mixing and through shears mixing of water bath shaker. Static uniaxial compression tests were conducted to investigate how the unsaturated polyester resins with nanoclay contents and processing will effect on the compressive stress-strain behaviour and compression properties. The experimental results show that the compressive strength and elastic modulus of nanomodified resin are significantly affected by type of mixing methods to prepare the specimens and the ratio of nanoparticles content during mixing. It was found out that the compressive strength and compressive modulus increase with the nanoclay content. The findings also indicate the dispersion of nanoclay by hand-mixed method yield higher compressive strength compared to that dispersed by water shaker bath.

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6

SELYAEV, V. P., L. I. KUPRIYASHKINA, E. L. KECHUTKINA, N. N. KISELEV y O. V. LIYASKIN. "Mechanical Characteristics of Vacuum Thermal Insulation Panels: Deformation Diagrams, Strength, Deformation Modules". Stroitel'nye Materialy 785, n.º 10 (2020): 44–51. http://dx.doi.org/10.31659/0585-430x-2020-785-10-44-51.

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The results of studying the mechanical properties of vacuum insulation panels are presented. The compressive strength and deformation modules (elastic and secant) under compression and shear are determined. The dependence of the mechanical characteristics of vacuum insulation panels (VIP) on the type and quantitative ratio of fillers is shown. It is established that the diagram of deformation of the VIP under compression can be described by an analytical function. Experimental studies of the properties of VIP have established that the deformation diagram of VIP has the form characteristic for materials that self-strengthen during loading with a compressive load and is adequately described by the function of G. V. Bulfinger. A method is proposed for determining the coefficients α and β that makes it possible to verify the approximating function using experimental data. Polynomial models describing the dependence of the elastic modulus, strength, and thermal conductivity coefficient on the composition and quantitative ratio of fiber and powder fillers are developed. It is established that the numerical values of the strain modulus depend on the type, amount of powder filler, and their ratio to the fibrous filler. The values of strain and strength models increase with increasing content and size of filler particles. A method for determining the shear modulus for VIP has been developed. It has been experimentally established that the value of the shear modulus for VIP depends on both the filler composition and the characteristics of the panel film shell. Keywords: vacuum insulation panel, diatomite, silica fume, thermal conductivity, strength, compression, shear, modulus of deformation.

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7

Xu, Minjun, Xiaochuan Chen, Jun Wang y Yong Li. "Finite element analysis modeling research on the compression process of cotton fiber assembly". Textile Research Journal 90, n.º 11-12 (7 de noviembre de 2019): 1414–27. http://dx.doi.org/10.1177/0040517519886558.

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In order to analyze the compressive stress state of a cotton fiber assembly in the compression process, a new cotton fiber assembly model, the tetrakaidecahedral porous cotton fiber assembly model, is presented based on the idea of three-dimensional open-cell foam material modeling. Based on the model, the compression process of cotton fiber assembly is analyzed using the finite element method. The change in the compressive stress of the cotton fiber assembly in the compression process is successfully described. The measurement method of compressive modulus of the cotton fiber assembly is also studied, and the relation between compressive modulus and relative density of the cotton fiber assembly is determined. Finally, the effect of different moisture regain on compressive stress of the cotton fiber assembly is analyzed, and the reference value of moisture regain in the cotton baling process is given. The results show that the simulation results are consistent with the actual situation. Therefore, the established model of cotton fiber assembly has validity.

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8

Wang, Chen y Wentao Li. "Factors Affecting the Mechanical Properties of Cement-Mixed Gravel". Advances in Materials Science and Engineering 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/8760325.

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A study has been conducted to investigate the mechanical properties of cement-mixed gravel using the unconfined compression test and the tensile test. Basic factors including the curing period, the water-binder ratio, the cement content, and the strain rate were evaluated. Ordinary Portland cement with fly ash was employed as the cementation agent for preparing cemented samples. The results indicate that the unconfined compressive strength, the deformation modulus, and the tensile strength increase with the increase in the curing period. The ratio of tensile strength to unconfined compressive strength has no distinct change after 7 days. An optimum water-binder ratio can be obtained. The unconfined compressive strength and deformation modulus decrease as the water-binder ratio decreases and increase from the optimum water-binder ratio. With the increasing of the cement content, the unconfined compressive strength increases distinctly, the deformation modulus increases significantly when the cement content is less than 4% and then increased slowly, and the failure strain increases to a peak value and then decreases. With the increasing of the strain rate, the unconfined compressive strength increases slightly and the deformation modulus increases slowly. The failure strain decreases with an increase in the strain rate.

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9

Hou, Yun Fen y Dong Min Wang. "The Effect of Activators on the Fly Ash-Based Geopolymers". Key Engineering Materials 477 (abril de 2011): 85–90. http://dx.doi.org/10.4028/www.scientific.net/kem.477.85.

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This paper studies the influences of concentration and modulus of sodium silicate solution (Na activator) and sodium potassium silicate solution (Na-K activator) on the phase composition, microstructure and strength development in the geopolymers prepared using Class F fly ash. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and MAS NMR were utilized. It shows that the compressive strength increases while Na activator solution modulus increases, but when modulus exceeds 1.4, the compressive strength decreases, and it decreases markedly while modulus is greater than 2.0. The compressive strength improves with increase of sodium silicate solution concentration, and when concentration is 32%, compressive strength reaches the maximum, and then it reduces with concentration increment. It shows that the compressive strength increases while Na-K activator solution modulus increases, but when modulus exceeds 1.7, the compressive strength decreases, and it decreases markedly while modulus is greater than 2.0. The compressive strength improves with increase of Na-K activator solution concentration, and when concentration is 36%, compressive strength reaches the maximum. The main product of reaction in the geopolymeric material is amorphous alkali aluminosilicate gel.

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10

Wang, Min, C. L. Au, P. K. Lai y William Bonfield. "Tensile and Compressive Behaviours and Properties of a Bone Analogue Biomaterial". Key Engineering Materials 284-286 (abril de 2005): 693–96. http://dx.doi.org/10.4028/www.scientific.net/kem.284-286.693.

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For the purpose of mimicking the structure and matching mechanical properties of human cortical bone, a natural composite material, hydroxyapatite (HA) reinforced high density polyethylene (HDPE) has been developed as a bioactive, analogue material for bone replacement. This synthetic composite material is now in clinical use. To understand the deformation behaviour and determine mechanical properties of HA/HDPE composite under different loading modes and loading conditions, tensile and compression tests were performed in the current investigation. It was observed that under tension, HA/HDPE composite exhibited two types of deformation behaviour: ductile and brittle. Under compression, the composite deformed in a ductile manner and did not fracture at high compressive strains. It was found that an increase in HA content resulted in increases in Young’s modulus, compressive modulus, tensile strength and compressive yield strength of the composite. A higher strain rate led to higher modulus and strength values and lower tensile fracture strains of the composite.

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Más fuentes

Tesis sobre el tema "Compressive modulus"

1

Ip, Felix. "Compressive strength and modulus of elasticity of masonry prisms". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0019/MQ48451.pdf.

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2

Ip, Felix (Mong Kau Felix) Carleton University Dissertation Engineering Civil and Environmental. "Compressive strength and modulus of elasticity of masonry prisms". Ottawa, 1999.

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3

Schoppe, Brett Michael. "SHRINKAGE & MODULUS OF ELASTICITY IN CONCRETE WITH RECYCLED AGGREGATES". DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/500.

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This paper presents results on experimental research for concrete produced using recycled coarse aggregates (RCA). Five types of coarse aggregates were used in this study, four of which were RCA. The main purpose of this research was to examine how different types and properties of coarse aggregate affected compressive strength, modulus of elasticity, and shrinkage in concrete when natural coarse aggregates were replaced with RCA. Concrete batches were made with water-cement (w/c) ratios of 0.30, 0.45, and 0.60, and substitution percentages ranged from 0% to 100% of natural aggregate with RCA. Test results clearly show that compressive strength, modulus of elasticity, and shrinkage greatly depend on the quality and type of coarse aggregate used. In addition to testing of hardened concrete, predictive models for elasticity and ultimate shrinkage were developed to formulate and reinforce proposed conclusions about the properties and performance for the different RCA.

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4

Berenberg, Barry J. (Barry James). "Effect of interweaving on the axial compressive strength and modulus of filament-wound composite cylinders". Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/44266.

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5

Yoo, Jiyoun. "Modeling Compressive Stress Distributions at the Interface between a Pallet Deck and Distribution Packaging". Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/39939.

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Three components, a pallet, packaging, and material handling equipment, of the unit load portion of the supply chain are physically and mechanically interacting during product storage and shipping. Understanding the interactions between two primary components, a pallet and packaging, in a unit load is a key step towards supply chain cost reduction and workplace safety improvement. Designing a unit load without considering physical and mechanical interactions, between those two components, can result in human injury or death caused from a unsafe workplace environment and increased supply chain operating costs, due to product damage, high packaging cost, disposal expense, and waste of natural resources. This research is directed towards developing predictive models of the compressive stress distributions using the principle of the beam on an elastic foundation and experimentally quantifying the compressive stress distributions. The overall objective of this study is to develop a model that predicts compressive stress distributions at the interface between a pallet deck and packaging as a function of: pallet deck stiffness, packaging stiffness, and pallet joint fixity. The developed models were validated by comparison to the results of physical testing of the unit load section. Design variables required for modeling included Modulus of Elasticity (MOE) of pallet deckboards, Rotation Modulus (RM) for nailed joints, and packaging stiffness. Predictive models of the compressive stress distributions were non-uniformly distributed across the interface between pallet deckboards and packaging. Maximum compressive stresses were observed at the deckboard ends over stringer segments. All predictive compressive stress distributions were influenced by pallet deck stiffness, packaging stiffness, and joint fixity. The less the joint fixity the greater the pallet deck deflection. The stiffer deckboards are more sensitive to joint fixity. For predictive compressive stress distribution models, the measure of the stress concentrations was the Compressive Stress Intensity Factor (SIF), which was the ratio of the estimated maximum compressive stress to the applied stress. Less stiff pallets and stiffer packaging resulted in greater SIF for all end condition models. SIF was reduced by stiffer joint, stiffer pallet deck and more flexible packaging. The stiffer the pallet deck and pallet joint the greater the effective bearing area. The lower stiffness packaging resulted in the greater effective bearing area with all three packages. The predicted effective bearing area was more influenced by pallet deck stiffness than the packaging stiffness. The developed prediction models were validated by comparison to experimental results. All prediction models fell within 95% confidence bounds except the 3/8-inch deck with free ends and 3/4-inch deck with fixed ends. The difference between predicted and measured results was due to a limitation in pressure sensor range and test specimen construction for the free end model and fixed end model, respectively. The results show effects of pallet deck stiffness and packaging stiffness on SIFs with percentage changes ranging from 2 to 26% (absolute value of change) for all three end conditions. The sensitivity study concluded that changing both pallet deck stiffness and packaging stiffness more significantly influenced the SIFs than bearing areas.
Ph. D.

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6

Pfeiffer, Emily (Emily R. ). "The effects of glycosaminoglycan content on the compressive modulus of chondrocyte seeded type II collagen scaffolds". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40463.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
Includes bibliographical references (p. 34-36).
This study examines glycosaminoglycan (GAG) density and aggregate compressive modulus HA of engineered cartilaginous implants. Culture parameters were developed to cause the goat articular chondrocyte seeded type II collagen scaffolds to generate 25 and 50% of the natural biochemical content of articular cartilage, with an overall goal of identifying construct compositions that might provide the most favorable response when implanted into defects in articular cartilage. Several scaffold cross-link densities were compared across constructs cultured in vitro to several time-points. The compressive modulus HA was measured through unconfined compression. One group of scaffolds averaged a compressive modulus one order of magnitude below that of natural tissue. Histological analysis verified that a chondrogenic phenotype was maintained and revealed a concentration of tissue development in the center of most scaffolds. This work includes a design for an original mechanical test apparatus for measuring the Poisson's ratio of the samples, enabling meaningful interpretation of indentation test results.
by Emily Pfeiffer.
S.B.

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7

Zhang, Lianyang. "Determination and applications of rock quality designation (RQD)". Elsevier/SCIENCE PRESS, 2016. http://hdl.handle.net/10150/622156.

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Characterization of rock masses and evaluation of their mechanical properties are important and challenging tasks in rock mechanics and rock engineering. Since in many cases rock quality designation (RQD) is the only rock mass classification index available, this paper outlines the key aspects on determination of RQD and evaluates the empirical methods based on RQD for determining the deformation modulus and unconfined compressive strength of rock masses. First, various methods for determining RQD are presented and the effects of different factors on determination of RQD are highlighted. Then, the empirical methods based on RQD for determining the deformation modulus and unconfined compressive strength of rock masses are briefly reviewed. Finally, the empirical methods based on RQD are used to determine the deformation modulus and unconfined compressive strength of rock masses at five different sites including 13 cases, and the results are compared with those obtained by other empirical methods based on rock mass classification indices such as rock mass rating (RMR), Q-system (Q) and geological strength index (GSI). It is shown that the empirical methods based on RQD tend to give deformation modulus values close to the lower bound (conservative) and unconfined compressive strength values in the middle of the corresponding values from different empirical methods based on RMR, Q and GSI. The empirical methods based on RQD provide a convenient way for estimating the mechanical properties of rock masses but, whenever possible, they should be used together with other empirical methods based on RMR, Q and GSI. (C) 2016 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V.

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8

Feng, Qingming. "Applying Mine Tailing and Fly Ash as Construction Materials for a Sustainable Development". Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/594926.

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Geopolymerization has been considered as a new technology to replace the ordinary Portland cement in construction industry. It provides an option to manage the industry waste and byproducts like fly ash, mine tailings. At the same time, the CO₂ emissions can be reduced about 80% compared to that of ordinary Portland cement. The present research includes three main parts. First part is applying mine tailings as construction materials using geopolymerization method. The study is focused on efficiently activating mine tailings, reducing alkali consumption, decreasing curing time and improving compressive strength. We investigate the activation temperature effects, the impacts of additives and effects of forming pressures. The results show that a 40 MPa unconfined compressive strength (UCS) can be achieved with the geopolymerization samples after mine tailings are activated by sodium hydroxide at 170°C for 1 hour with the addition of calcium hydroxide and alkali dissolved aluminium oxide, further compressed with a 10 MPa forming pressure and finally cured at 90°C for 3 days. To elucidate the mechanism for the contribution of additives to geopolymerization, microscopic and spectroscopic techniques including scanning electron microscopy/ energy-dispersive X-ray spectroscopy (SEM/EDX), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy are used to investigate the micro/nanostructure and the elemental and phase composition of geopolymerization specimens. The stress-strain behavior was also characterized. The results shows that the mechanical behavior is similar with that of concrete and the dynamic modulus is 22 GPa, which is comparable with that of concrete. The Young's modulus of geopolymer product was also calculated and the value is in the range of 2.9 to 9.3 GPa. The findings of the present work provide a novel method for the geopolymerization of mine tailings as construction materials. Second section is applying fly ash as a high strength water-resistant construction material. Through the present investigation, a procedure has been studied. The experiment results indicate that the concentration of NaOH, water content, and curing condition can significantly affect the mechanical property of geopolymer matrix. At the same time, the chemical composition, especially the Si/Al ratio and calcium content, is also an important factor during geopolymerization. XRD results show that the amorphous feature can be observed for both high and low calcium fly ash. It is the key of the success of geopolymerizaton due to its high reactivity. XRD, FTIR and SEM tests were performed to study how experiment conditions and the properties of fly ash affect geopolymerization. The obtained compressive strength of the geopolymerization product can reach above 100 MPa. The stress-strain behavior was also characterized. The results shows that the dynamic modulus is 36.5 GPa. The product obtained from the present work shows very high water resistance without losing any compressive strength even after a one month soaking time. Third part is applying the mixture of class C fly ash and mine tailings as construction materials. Through the present investigation, a protocol has been set up. The experiment results of the present work also help set up the working conditions such as activation temperature and time, the concentration of NaOH, the addition of Ca(OH)₂, forming pressure, mine tailing to class C fly ash weight ratio, curing temperature and curing time. To elucidate the mechanism for the contribution of additives to geopolymerization, microscopic and spectroscopic techniques such as SEM/EDX, X-ray diffraction and FTIR spectroscopy were used to investigate the micro/nanostructure and the elemental and phase composition of geopolymerization composite. The obtained compressive strength of the geopolymerization product can reach above 60 MPa. The stress-strain behavior of the geopolymer matrix of the mixture of mine tailing and fly ash were also characterized and the results show that the mechanical behavior is similar to that of concrete with a 24 GPa dynamic modulus. The Young's modulus of geopolymer product was also calculated and the value is in the range of 4.0 to 13.5 GPa. The findings of the present work provide a novel method for the geopolymerization of the mixture of mine tailings and class C fly ash as construction materials, such as bricks for construction and road pavement.

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9

Kocuba, Robert. "Diagnostika a hodnocení prefabrikované železobetonové konstrukce". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-372269.

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This thesis deals with inspection and constructionally technical research of reinforced concrete prefabricated construction from the second half of 20th century. In theoretical part, the research of literature, documents and valid standards is performed, with a focus on production and construction of prefabricated elements and also on the metodology of research. In practical part, the detection of reinforcement of individual elements of the construction and concrete properties is performed. The result of this work is the assessment of the state of the construction, static calculation of the ceiling panel and idea proposal for eventual reconstruction.

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10

Parente, Everton Bezerra. "Avaliação do comportamento mecânico das misturas de solo-cimento e fosfogesso e cimento para uso na construção rodoviária". Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-05052016-091724/.

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Esta dissertação apresenta os resultados de uma pesquisa cujo objetivo principal é avaliar o comportamento mecânico de misturas de solo-cimento e fosfogesso e cimento destinadas à construção de bases rodoviárias. O solo-cimento é um material de uso consolidado em pavimentação. Na composição das misturas de solo-cimento foram utilizados dois diferentes solos pertencentes a um mesmo grupo segundo as classificações HBR e USCS, mas considerados, respectivamente, de comportamento laterítico, segundo a classificação MCT. O fosfogesso é um resíduo sólido na produção de adubos, constituindo-se em um elemento agressivo ao meio ambiente devido a sua natureza ácida e por conter elementos radioativos e metais pesados. Por ser instável frente a ação da água, este material deverá ser estabilizado com cimento para uso em pavimentos. As amostras destas misturas foram submetidas a ensaios de compressão simples, compressão diametral e triaxiais cíclicos. Nos ensaios de compressão simples e compressão diametral, metade dos corpos de prova foi submetida a imersão prévia em água por quatro horas antes dos ensaios e a outra metade foi ensaiada sem imersão. Os corpos de prova com teores de 4, 7 e 10% foram compactados na energia normal de ensaio de Proctor e curados por 3, 7 e 28 dias. Para as misturas de fosfogesso e cimento foram utilizados apenas os teores de 7 e 10%. Observou-se que valores crescentes de tempo de cura e teor de cimento conduziram a maiores valores de resistência e rigidez. Ensaios realizados após imersão em água apresentaram valores de resistência à compressão diametral menores do que os obtidos sem imersão. Os resultados dos ensaios triaxiais cíclicos mostram o efeito predominante da tensão desvio no valor do módulo de resiliência quando comparado com o efeito da tensão de confinamento. Concluiu-se também que as misturas compostas de solo de comportamento laterítico apresentam melhor desempenho que as ) misturas compostas com solos de comportamento não laterítico. Comparando-se o desempenho mecânico das misturas de solo-cimento com o das misturas de fosfogesso e cimento, estas últimas apresentam resistência e rigidez significativamente menores. Entretanto, o desempenho das misturas de fosfogesso e cimento, principalmente no tocante à deformabilidade, é comparável ao de materiais empregados em pavimentação, como algumas bases estabilizadas granulometricamente de uso corrente.
This work presents the results of a research whose main objective is to evaluate the mechanical behavior of soil-cement and phosphogypsum and cement mixtures for the construction of road bases. The soil-cement is a traditional useful material in pavement construction. The in composition of the soil-cement mixtures were used. Two different soils with same HRB and USCS classifications, but considered, respectively, of lateritic and non-Iateritic behavior, according to the MCT classification. The phosphogypsum is a solid by-product of the fertilizers production, it\'s an aggressive element to the environment due to its acid nature and for containing radioactive elements and heavy metals. For being unstable in the presence of water, this material should be stabilized with cement for use in pavements. The samples of these mixtures were submitted to tests of unconfined compressive strength, diametral compression and cyclic triaxial loading test. In the tests of unconfined compressive strength and diametral compression, half of the specimens were submitted previous immersion in water for four hours before the test and the other half was tested without immersion. The specimens with cement content of 4, 7 and 10% were compacted using the normal energy of Proctor test and cured during 3, 7 and 28 days. For the phosphogypsum and cement mixtures were just used cement content of 7 and 10%. It was observed that higher values of time of cure and cement content led to higher strength and stiffness values. Tests performed after immersion in water presented strength values for the unconfined compressive and diametral compression strength than those obtained without immersion. The results of the cyclic triaxial loading test show the predominant effect of the deviateric stress in the value of the resilience modulus when compared with the effect of the confinement tension. It was also concluded that the mixtures composed with lateritic behavior soil presented better performance than mixtures composed with non lateritic behavior soil.Comparing the mechanical performance of the soil-cement mixtures with the one of the phosphogypsum and cement mixtures, the last one presents strength and stiffness signiflcantly lower. However, the performance of the phosphogypsum and cement mixtures, mainly concerning the deformability, is comparable to the performance of materials employed in paving, as some soil stabilized bases.

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Más fuentes

Libros sobre el tema "Compressive modulus"

1

Sohi, Mohsen M. The effect of resin toughness and modulus on compressive failure modes of quasi-isotropic graphite/epoxy laminates. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1986.

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Sohi, Mohsen M. The effect of resin toughness and modulus on compressive failure modes of quasi-isotropic graphite/epoxy laminates. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1986.

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Rice, Robert F. Algorithms for a very high speed universal noiseless coding module. Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1991.

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Center, Lewis Research, ed. Low cost manufacturing approach of high temperature PMC components. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1997.

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Center, Lewis Research y United States. National Aeronautics and Space Administration., eds. Low cost manufacturing approach of high temperature PMC components. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1997.

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Hollis, Murray. Practical Straw Bale Building. CSIRO Publishing, 2005. http://dx.doi.org/10.1071/9780643092143.

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Building with straw bales is being embraced by amateurs and professionals for its versatility, comfort, environmental friendliness and high insulation. New methods should expand its growing worldwide popularity. In Practical Straw Bale Building, Murray Hollis uses simple, easy to understand language to describe the established techniques of straw bale construction and ways in which they can be improved. He also presents a new straw bale construction system that has substantial benefits over current methods. This system incorporates a new tensioning system that replaces the use of fence strainers for tensioning the hold-down/compression wires and eliminates uneven tensioning on opposite sides of the wall. It also allows for fabricating wall modules on-site as horizontal modules that are then swung into the vertical wall position after fabrication. Aspects of structures other than walls are addressed only to the extent that they are relevant to the use of straw bales, e.g. issues such as types of floors, roof structures and methods of heating or cooling. The innovative methods in this book will help to progress straw bale building technology and move it into the mainstream of the building industry.

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-H, Shih T. y United States. National Aeronautics and Space Administration., eds. An NPARC turbulence module with wall functions: Under cooperative agreement NCC3-370. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Property evaluation of LTM25 composite materials. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1996.

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Capítulos de libros sobre el tema "Compressive modulus"

1

ven der Zwaag, S. y G. Kampschoer. "Compressive Failure in High Modulus Polymeric Fibres". En Integration of Fundamental Polymer Science and Technology—2, 545–49. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1361-5_83.

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Umehara, S., S. Tadano, K. Kaneda, K. Abumi, S. Asano y T. Ukai. "Distribution of Axial Compressive Elastic Modulus in Degenerated Intervertebral Discs". En Clinical Biomechanics and Related Research, 314–25. Tokyo: Springer Japan, 1994. http://dx.doi.org/10.1007/978-4-431-66859-6_28.

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Suzila, R., M. S. Hamidah, A. Anizahyati y M. R. Ahmad Ruslan. "Fibre Reinforced Modulus of Elasticity and Compressive Strength of Foamed Concrete". En InCIEC 2013, 589–96. Singapore: Springer Singapore, 2014. http://dx.doi.org/10.1007/978-981-4585-02-6_51.

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Jamshidi, Ali y Greg White. "Comparing Compressive and Flexural Dynamic Asphalt Modulus by Statistical and Neural Network Modelling". En RILEM Bookseries, 421–27. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-46455-4_53.

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Ginting, Arusmalem. "Effect of Sand Proportion on Fineness Modulus of Combined Aggregate, Workability, and Compressive Strength of Concrete". En Lecture Notes in Civil Engineering, 468–75. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6311-3_54.

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Ngo, Van Thuc, Tien Thanh Bui, Thi Cam Nhung Nguyen, Thi Thu Nga Nguyen y Thanh Quang Khai Lam. "Effect of Nano-Silica Content on Compressive Strength and Modulus of Elasticity of High-Performance Concrete". En Lecture Notes in Civil Engineering, 153–59. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0053-1_19.

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Gooch, Jan W. "Compression Modulus". En Encyclopedic Dictionary of Polymers, 162. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2771.

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Aziz, Fauziah, Mohd Fadzil Arshad y Hazrina Mansor. "The Effect of Grouting Material to the Compressive Strength and Modulus of Elasticity of the Biaxial Interlocking Block Prisms". En Lecture Notes in Civil Engineering, 19–32. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1193-6_3.

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Gooch, Jan W. "Modulus in Compression". En Encyclopedic Dictionary of Polymers, 467. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_7586.

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Bierögel, C. y W. Grellmann. "Compression creep modulus – data". En Polymer Solids and Polymer Melts–Mechanical and Thermomechanical Properties of Polymers, 387. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55166-6_61.

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Actas de conferencias sobre el tema "Compressive modulus"

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Jahanian, Shahriar y A. J. McPhate. "Approximate Residual Interface Compression in a Laminated Magnet". En ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0072.

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Abstract Present design of large laminated magnets are based on effective modulus of elasticity for the plate stack that is invariant with interplate compression. Experimental results indicates this is not a valid assumption. This analysis considers the specific design used for compact electron storage ring dipole magnet at the Center for Advanced Micro Devices (CAMD) at Louisiana State University. An iterative technique, using FEM is developed to approximate the effective modulus throughout the magnet structure. This particular magnet is constructed from 1424 steel plates (1.5mm × 610mm × 780mm) by first compressing a 45° 2.93m raduis curvilinear stack to a specified preload and then welding straight and curved straps to the exterior of the stack. Release of the preload allowsexpansion of the stack and forces stretch of the straps, the resultant interplate compression is considerably different from the initial preload and varies throughout the magnet. The analysis technique introduced in this paper is a simplified approach to the interplate compression modeling and consists of the supeposition of two simple analysis; one with straps attached, one without straps attached. An iterative approach is used to incorporate the dependence of effective compressive modulus on the interplate compression. An estimate of the average modulus is assumed for the entire stack and residual compression is calculated. From this residual compression and from experimental data, a distribution of compressive modulus throughout the magnet is computed. From this computed distribution, a new estimate for the compressive modulus is made for each element of the model and the analysis iterated. The net results are the compressive modulus distribution throughout the magnet ia a form suitable in subsequent dynamic analysis.

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GHAFFARI, SARVENAZ, ANDREW MAKEEV, DMYTRO KUKSENKO y GUILLAUME SEON. "Understanding High-Modulus CFRP Compressive Strength Improvement". En American Society for Composites 2019. Lancaster, PA: DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/asc34/31352.

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MITSUMATA, TETSU, KENTA FURUKAWA, ETIENNE JULIAC, KENJI IWAKURA y KIYOHITO KOYAMA. "COMPRESSIVE MODULUS OF FERRITE CONTAINING POLYMER GELS". En Proceedings of the Eighth International Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777546_0071.

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Widayani, Y. Susanah, L. S. Utami, S. N. Khotimah y S. Viridi. "Compressive elastic modulus of natural fiber based binary composites". En INTERNATIONAL CONFERENCE ON PHYSICS AND ITS APPLICATIONS: (ICPAP 2011). AIP, 2012. http://dx.doi.org/10.1063/1.4730742.

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Dang, Xudan, Xinli Wang, Meng Wei y Jun Xiao. "Finite element analysis of X-cor sandwich's compressive modulus". En Mechanical Engineering and Information Technology (EMEIT). IEEE, 2011. http://dx.doi.org/10.1109/emeit.2011.6023615.

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Park, Seonghun, Ramaswamy Krishnan, Steven B. Nicoll y Gerard A. Ateshian. "Cartilage Interstitial Fluid Load Support in Unconfined Compression". En ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32620.

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Under physiological conditions of loading, articular cartilage is subjected to both compressive strains, normal to the articular surface, and tensile strains, tangential to the articular surface. Previous studies have shown that articular cartilage exhibits a much higher modulus in tension than compression. Theoretical analyses have suggested that this tension-compression nonlinearity enhances the magnitude of interstitial fluid pressurization during loading in unconfined compression, above a theoretical threshold of 33% of the average applied stress. The first hypothesis of this experimental study is that the peak fluid load support in unconfined compression is significantly greater than the 33% theoretical limit predicted for porous permeable tissues modeled with equal moduli in tension and compression [1]. The second hypothesis is that the peak fluid load support is higher at the articular surface side of the tissue samples than near the deep zone, because the disparity between the tensile and compressive moduli is greater at the surface zone.

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Tummala, Subhakar, Oguz Dogan, Fatih Karpat, Shahram Riahinezhad y M. Khandaker. "Evaluation of Biomechanical Performances of Electrospun Fiber Anchored Silicone Disc As an Intervertebral Disc Implant". En ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70957.

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A tissue engineered intervertebral disc (IVD) anchor the circumference and top/bottom sides of nucleus pulposus (NP) implants with annulus fibrosus and endplates. The proper anchorage of a NP implant to annulus fibrosus and endplates is possible by enclosing the NP by electrospun fiber mesh that mimics the surrounding structures. The biomechanical performance of silicone based NP can be improved if electrospun fiber mesh can secure all sides of silicone NP. However, it is unknown whether silicone surrounded by an electrospun nanofiber matrix can better restore the biomechanical functions of the disc in compare to intact, IVD made with silicone only, and, IVD made with silicone anchored all sides by nanofiber. This study compared the compressive and viscoelastic properties of a silicone and electrospun nanofiber anchored silicone discs (ENAS) under compression and shear with the same properties of human NP. This study developed a nonlinear finite element model (FEM) for the intact and ENAS implanted human lumbar vertebra segments. The compression test results show that ENAS disc compressive modulus (87.47 ± 7.56 kPa, n = 3) is significantly higher in compare to silicone gel (38.75 ± 2.15 kPa, n = 3) and the value is within the range of the compressive modulus of human NP (64.9 ± 44.1 kPa). The rheological test results show that ENAS disc compressive modulus (16 ∼ 40 kPa) is significantly higher in compare to silicone gel (0.10 ∼ 0.16 kPa) and the value is within the range of the compressive modulus of human NP (7 ∼ 20 kPa). These results confirm the suitability of ENAS disc over silicone as NP implant. A finite element model has been developed based on the ENAS properties. The FEA results showed that ENAS can restore better the biomechanical motions of a lumbar vertebra segments in compare to silicone NP.

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Stender, Michael E., Christopher B. Raub, Kevin A. Yamauchi, Reza Shirazi, Pasquale Vena, Robert L. Sah, Scott J. Hazelwood y Stephen M. Klisch. "Integrating qPLM and Biomechanical Test Data With an Anisotropic Fiber Distribution Model and In Vitro Regulation of Articular Cartilage Fiber Modulus". En ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14092.

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Articular cartilage (AC) metabolism and mechanical properties are regulated by in vitro culture with transforming growth factor–beta 1 (TGF-β1) and insulin-like growth factor–1 (IGF-1) [1]. In general, TGF-β1 maintains tissue size accompanied by a maintenance or increase in tensile and compressive moduli and a maintenance or decrease of compressive Poisson’s ratios while IGF-1 produces significant tissue expansion at the expense of reduced tensile and compressive moduli and increased compressive Poisson’s ratios [1,2]. The goal of this study was to integrate experimental data including AC mechanical properties, biochemical contents including overall collagen (COL) volume fraction, and micro structural measures of COL fiber distribution with a continuum mixture model to predict how COL fiber modulus changes in vitro with TGF-β1 and IGF-1 treatment.

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Afifipour, Mohammad y Parviz Moarefvand. "Uniaxial Compressive Strength and Elastic Modulus of Artificial Low-Cemented Geomaterials". En Geo-Shanghai 2014. Reston, VA: American Society of Civil Engineers, 2014. http://dx.doi.org/10.1061/9780784413395.018.

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Mahmoodian, Roza, Jeremi Leasure, Sorin Siegler y Franco Capaldi. "Characterization of Compressive Behavior of Developing Human Talus". En ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67851.

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Mechanical characterization of human cartilage anlagen is required in order to effectively model congenital musculoskeletal deformities. Such modeling can effectively explore the effect of treatment procedures and potentially suggest enhanced treatment methods. We therefore determined the stress relaxation behavior of cartilage plugs obtained from third-trimester still-born fetuses in unconfined and confined compression geometries. The material parameters determined were the aggregate modulus HA = 0.15 ± 0.07 MPa, permeability coefficients k0 = 2.01 ± 0.8 × 10−14m4N−1s−1 and M = 4.6 ± 1.0, Young’s modulus Es = 0.06 ± 0.03 MPa, and Poisson’s ratio ν = 0.4 ± 0.06. As compared to adult articular cartilage, stiffness was an order of magnitude lower than the values reported in the literature, inferring the relative softness of the tissue; and the permeability was an order of magnitude higher indicating relative ease of flow in the tissue. Poisson’s ratio also was close to the higher end of the range found in previous studies. Such material is expected to deform and relax to larger extents.

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Informes sobre el tema "Compressive modulus"

1

Becker, Peter J. Using the Light Weight Deflectometer for Performance-Based Quality Assurance Testing of Cement Modified Subgrades. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317304.

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This report documents the findings from SPR-4230 (Alternative Quality Assurance Methods for Compacted Subgrade). The main objective of SPR-4230 involved establishing performance-related quality assurance (QA) test methods for pavement subgrade construction. Because INDOT generally prefers specifying subgrade treatment type IBC (i.e., 14-in. cement modified subgrade), this study focused on performance-based QA test methods for constructing cement modified subgrade. Moreover, INDOT prefers using light weight deflectometer (LWD) for chemically modified subgrade construction acceptance, so this study aimed to use LWD deflection measurements as performance-related construction acceptance criteria. A laboratory study was performed to relate LWD deflections with resilient modulus that is the key subgrade performance-related parameter in pavement design. In addition, LWD deflections were related with unconfined compressive strength increase that is the key parameter in chemical soil modification mix design. A rigorous field study consisting of LWD testing and falling weight deflectometer (FWD) testing at INDOT new pavement construction sites was conducted to verify the laboratory developed relationship. Recommendations for implementing results of this study into cement modified subgrade construction acceptance is provided, as are recommendations for future research.

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McCarty, Sean y Pania Newell. Impact of Elastic Moduli in Tension and Compression in Geomaterials. Office of Scientific and Technical Information (OSTI), marzo de 2017. http://dx.doi.org/10.2172/1494180.

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Shives, T. Robert y Richard J. Fields. Modulus of elasticity and Poisson's ratio for types 17-4 PH and 410 stainless steels in compression. Gaithersburg, MD: National Institute of Standards and Technology, 1991. http://dx.doi.org/10.6028/nist.ir.4671.

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HIFS-VNL, Peter Seidl, P. Seidl, J. Barnard, F. Bieniosek, J. Coleman, D. Grote et al. Use beam steering dipoles to minimize aberrations associated with off-centered transit through the induction bunching module. Design an improved NDCX-I drift compression section to make best use of the new bunching module to optimize planned initial NDCX-I target experiments. Office of Scientific and Technical Information (OSTI), marzo de 2008. http://dx.doi.org/10.2172/936604.

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