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http://dx.doi.org/10.14481/jkges.2021.22.12.41

Maximum Shear Modulus of Sand - Tire Chip Mixtures under Repetitive KO Loading Conditions  

Ryu, Byeonguk (Dept. of Civil Engineering, Kyung Hee Univ.)
Park, Junghee (School of Civil, Environmental and Architectural Engineering, Korea Univ.)
Choo, Hyunwook (Dept. of Civil and Environmental Engineering, Hanyang Univ.)
Publication Information
Journal of the Korean GEO-environmental Society / v.22, no.12, 2021 , pp. 41-50 More about this Journal
Abstract
This study investigated the changes in engineering characteristics of sand-tire chip mixtures during repetitive loading. To quantify the changes in the maximum shear modulus according to the tire chip content in the mixtures and the particle size ratio between sand particle and tire chip, the samples were prepared with tire chip content of TC = 0, 10, 20, 40, 60, and 100%, and the particle size ratios SR were also set to be SR = 0.44, 1.27, 1.87, and 4.00. The stress of the prepared sample was applied through a pneumatic cylinder. The experiment was conducted in the order of static loading (= 50 kPa), cyclic loading (= 50-150 kPa), static loading (= 400 kPa) and unloading. The stress applied to tested mixtures was controlled by a pressure panel and a pneumatic valve by using an air compressor. The shear wave velocity was measured during static and cyclic loadings by installing bender elements at the upper and lower caps of the mold. The results demonstrated that the change in maximum shear modulus of all tested materials with varying SR during repetitive loading is the most significant when TC ~ 40%. In addition, the mixture with smaller SR at a given TC shows greater increase in maximum shear modulus during repetitive loading.
Keywords
Rigid-soft mixture; Repetitive loading; Maximum shear modulus; Structural skeleton; Tire chip content;
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