Small-Strain Dynamic Behavior of Sand and Sand–Crumb Rubber Mixture for Different Sizes of Crumb Rubber Particle

Abstract

This paper investigates the dynamic behavior of local Barak River sand mixed with different sizes of commercially available crumb rubber at low strain conditions. A series of torsional resonant column tests are conducted to determine the dynamic properties of local Barak River sand and sand–crumb rubber mixture (SCRM). It is aimed to study the effect of different influencing parameters such as confining pressure, relative density, and particle size of crumb rubber on the dynamic behavior of local Barak River sand. All the tests have been conducted under three different confining pressures of 50, 100, and 200 kPa. In this study, two types of crumb rubber with different ranges of particle sizes are mixed with the locally available Barak River sand in different percentages by weight. The test result confirms that the shear modulus is directly proportional to relative density and confining pressure. Higher values of shear modulus have been observed for the samples prepared using larger-sized crumb rubber particles. Moreover, the maximum shear modulus value for the larger crumb rubber is observed at a lower percentage of crumb rubber content compared to that for smaller-sized crumb rubber.