Abstract
In this study, rubber-sand particle mixtures are investigated to understand their stress-deformation and elastic modulus characteristics. Specimens are prepared with various size ratios, sr =Drubber/Dsand, between sand and rubber particles, and different volumetric sand fractions, sf =Vsand/Vtotal. Small strain shear waves are measured under a Ko-loading condition incorporated with the stress-deformation test by using an oedometer cell with bender elements. The stress-deformation and small strain shear-wave character- istics of rigid-soft particle mixtures show the transition from a rigid particle behavior regime to a soft particle behavior regime under a fixed size ratio. A sudden rise of the factor and the maximum value of the exponent in Gmax=o /kPa is observed at sf 0.4-0.6 regardless of the size ratio sr. The transition mixture shows a high sensitivity to the confining stress. The volume fraction for the minimum porosity may depend on the applied stress level in the rigid-soft particle mixtures because the soft rubber particles easily distort under load. In this experimental study, the size ratio and volumetric sand fraction are the important factors which determine the behavior of rigid and soft particle mixtures. DOI: 10.1061/ASCEMT.1943-5533.0000027 CE Database subject headings: Mixtures; Shear waves; Velocity; Stiffness; Rubber; Sand, material; Size effect. Author keywords: Ko-loading; Mixtures; Shear-wave velocity; Size ratio; Stiffness; Volume fraction.
Published Version
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