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http://dx.doi.org/10.7843/kgs.2011.27.3.085

Characteristics of Sand-Rubber Mixtures under Different Strain Levels: Experimental Observation  

Lee, Chang-Ho (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Byun, Yong-Hoon (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Lee, Jong-Sub (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.27, no.3, 2011 , pp. 85-94 More about this Journal
Abstract
Mixtures of sand and rubber particles ($D_{sand}/D_{rubber}=1$) are investigated to explore their characteristics under different stain level. Mixtures are prepared with different volumetric sand fractions ($sf=V_{sand}/V_{total}$). Experimental data are gathered from a resonant column, an instrumented oedometer, and a direct shear tests. Results show that sand and rubber differently control the behavior of the whole mixture with strain level. Non-linear degradation of small strain stiffness is observed for the mixtures with $sf{\geq}0.4$, while the mixtures with low sand fraction ($sf{\leq}0.2$) show significantly high elastic threshold strain. Vertical stress-deformation increases dramatically when the rubber particle works as a member of force chain. The strength of the mixtures increases as the content of rubber particle decreases, and contractive behavior is observed in the mixtures with $sf{\leq}0.8$. Rubber particle plays different roles with strain level in the mixture: it increases a coordination number and controls a plasticity of the mixture in small strain; it prevents a buckling of force chain in intermediate strain; it leads a contractive behavior in large strain.
Keywords
Compressibility; Sand-rubber mixture; Shear modulus; Strain level; Strength; Transition;
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