In this study, repeated load triaxial tests were conducted on crushed limestone and crushed gravel aggregates. Fines content and plasticity index were varied from 5% to 12% and 5% to 9%, respectively.
اقرأ أكثرThe uniaxial compression strength and elastic modulus of limestone decrease with increasing degree of saturation (Griggs 1936; Chen and Zhou 1991; Xu et al. 2008). Huang et al. ( 2006 ) pointed out the mechanical effect of water interacting with rock has a clear time dependence, and chemical corrosion significantly decreases …
اقرأ أكثرA series of triaxial compression tests and cyclic triaxial tests were conducted on unreinforced and geogrid reinforced crushed limestone samples to investigate the effects of the geogrid type ...
اقرأ أكثرSince it is self-evident that the concrete with a compressive strength of 0MPa has modulus of elasticity of 0MPa, the basic form of the equation is expressed as Eq.2. The parameters examined are compressive strength, modulus of elasticity, and unit weight at the time of compression test, as well as types and mechanical properties of materials for
اقرأ أكثرFor this study, 100 concrete mixtures were prepared with crushed limestone aggre- gate obtained in the Yucatan Peninsula. The results from the compressive strength and the ultrasonic pulse ...
اقرأ أكثرNote: As the modulus (E) values given above have been obtained by experiments on low strains, calculation of settlement made with these values may yield high value. Hence the following factors of safety are recommended to be adopted for settlement analysis. A high factor of safety of 2 to 3 is given for high E values corresponding 10 to …
اقرأ أكثرThis web page provides guidance on selecting soil and rock engineering properties for geotechnical design, including unit weight, shear strength, and other parameters. It also …
اقرأ أكثرIn this study, the effects of fine recycled concrete and glass aggregate on mechanical and durability performance of concrete were investigated. The waste concrete and glass were crushed, sieved and re-mixed to fulfill the same gradation as the available 0–4 mm crushed limestone aggregate size fraction. The recycled aggregates were …
اقرأ أكثرWhen the normalized values are lower than 1, the reference concrete exhibits higher compressive strength values, thus better concrete performance than the crushed sand concretes. The representation of Fig. 5 confirms that, for Mix 30 and Mix 40, the crushed sand concretes had equivalent or slightly lower compressive strengths …
اقرأ أكثرIn many geo-engineering fields, the uniaxial compressive strength (UCS) of a rock material is the parameter most commonly used to define a rock's mechanical strength. Several international standards have been developed for determining this value, which require the tested material to have certain minimum dimensions and shapes. In many …
اقرأ أكثرLearn how rocks and rock masses deform under different loads and stresses, and how to measure their elastic constants. The web page covers the deformability of intact rock, …
اقرأ أكثرIn these circumstances, published results of rock mass shear strength can be used in design. Figure 14-16 shows the results of back analyses of slope failures in a variety of …
اقرأ أكثر2.1. Materials. The TBM spoil material is a crushed powder of limestone. It is generally a poorly graded material, as classified using the unified soil classification system (USCS) or the ASTM D 2487 [].Table 1 presents the characterization test results performed in the laboratory. The specific gravity was 2.714, which was a little higher than that measured …
اقرأ أكثرThe coefficient of determination is as high as 0.769, and the 95% confidence interval of modulus of elasticity is within the range of ±8000MPa, as s hown in Fig.5.
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اقرأ أكثرThis paper investigates the interactions of aggregate strength characteristics with those of aggregate gradation, material type, fines content, dust ratio and plasticity …
اقرأ أكثر3.3 Evaluation of Coefficient a Thirdly, after fixing exponent b and exponent c at 1/3 and 2, respectively, the value for coefficient a was investigated. The relationship between modulus of elasticity, E, and the product of compressive strength to the 1/3 power and unit weight to the sec-
اقرأ أكثرIn this study, 31 empirical equations are summarized that relate unconfined compressive strength and internal friction angle of sedimentary rocks (sandstone, shale, and …
اقرأ أكثرFor the uniaxial and triaxial compression testing of the limestone at high temperatures (Fig. 1c), the MTS 815 rock mechanics testing system, which is composed of loading, testing, and control systems, was used.This system can be used for axial force or stress control, axial displacement or strain control, etc. and meets the requirements for …
اقرأ أكثرThe CF limestone has the highest compressive strength with an average value of 68.5 MPa due to the best integrity. The CC limestone has the lowest average compressive strength with a value of 7.5 MPa due to the very high porosity. ... The existence of pore water also influences the Young's modulus values of the samples. …
اقرأ أكثرIn this study, repeated load triaxial tests were conducted on crushed limestone and crushed gravel aggregates. Fines content and plasticity index were varied from 5% to 12% and 5% to 9%, respectively. Two most typical gradations of aggregates used in roadway construction in Illinois were utilized with dust ratios ranging from 0.4 to 1.0.
اقرأ أكثرThis paper presents results of a laboratory experimental program performed on limestone rock samples, using both static and dynamic methods. The objective is to compare elastic properties (elastic modulus and Poisson's ratio) for limestone rock, determined by static and dynamic methods, under different conditions. The static elastic …
اقرأ أكثرDynamic Young's modulus, Ed = 35.44 GPa In general, the dynamic Young's and shear moduli are larger than their static values (there are however instances where the opposite is true). Eissa and Kazi (1988) studied the relation existing between the static modulus E (secant or tangent) and the dynamic modulus, Ed.
اقرأ أكثرFurthermore, electric arc furnace slag coarse aggregate (EFG) was used as coarse aggregate to compare its influence on the properties of natural crushed coarse aggregate (NCA). Compressive ...
اقرأ أكثرLaboratory testing of samples indicated the dynamic pattern of the value of the aging coefficient and the aging rate in terms of the ultimate compressive strength at +50 °C and the elastic modulus.
اقرأ أكثرDownload scientific diagram | The values of physical and mechanical properties of limestone as a dimension stone according to the ASTM C568-03 (2006) from publication: EVALUATION OF THE PILA SPI ...
اقرأ أكثرThe modulus of subgrade reaction k s (also called the coefficient of subgrade reaction of soil) is the ratio of the pressure against a flat surface on soil and the settlement at that point. Mathematically, this is expressed as; k s = q/δ ——- (1). Where; k s = Coefficient of subgrade reaction expressed in force/length 2 /length q = pressure on …
اقرأ أكثر45 APPENDICES Appendix A A-2-4 Resilient Modulus Graphs/Data Appendix B A-4 Resilient Modulus Graphs/Data Appendix C A-6 Resilient Modulus Graphs/Data Appendix D Mexican Limestone Resilient Modulus Graphs/Data Appendix E Recycled PCC (Crushed) Resilient Modulus Graphs/Data 47 APPENDIX A A-2-4 Resilient Modulus …
اقرأ أكثرmodulus of elasticity are classified into three groups. The first group, which requires no correction factor, includes river gravel, crushed greywacke, etc. ;the second group, …
اقرأ أكثرRelatively small variations, when compared with modulus of elasticity, observed in the values of compressive strength of concrete with crushed stone (Table 9, Table 10, Table 11, Table 12) show that the quality of paste is much more important for strength than for stress-strain relationships and modulus of elasticity, where the …
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