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Evaluation of dynamic elastic modulus of concrete by shear wave velocity measurement

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Document pages: 13 pages

Abstract: The purpose of this study is to investigate the relationship between static and dynamic elastic modulus determined by shear wave velocity measurement, and to prove the practical potential of shear wave velocity method in field dynamic modulus evaluation. The 350 by 300   mm concrete cylinder is made of three different mixtures with target compressive strengths of 30, 35 and 40   MPa, respectively. Static and dynamic tests were conducted on days 4, 7, 14 and 28 to evaluate the compressive strength and static and dynamic modulus of the cylinder. The shear wave velocity measurement results are compared with the dynamic modulus obtained by the standard test method (measuring P-wave velocity according to ASTM c597 c597m-16 and basic longitudinal wave velocity)nd transverse resonance tests according to ASTM C215-14). The shear-wave velocity measured from cylinders showed excellent repeatability with a coefficient of variation (COV) less than 1 , which is as good as that of the standard test methods. The relationship between the dynamic elastic modulus based on shear-wave velocity and the chord elastic modulus according to ASTM C469 C469M was established. Furthermore, the best-fit line for the shear-wave velocity was also demonstrated to be effective for estimating compressive strength using an empirical relationship between compressive strength and static elastic modulus.

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