변형률에 따른 모래-고무 혼합재의 거동 특성: 실험적 관찰 = Characteristics of Sand-Rubber Mixtures under Different Strain Levels: Experimental Observation

다국어 초록 (Multilingual Abstract)

Mixtures of sand and rubber particles (Dsand/Drubber = 1) are investigated to explore their characteristics under different stain level. Mixtures are prepared with different volumetric sand fractions (sf = Vsand/Vtotal). 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≥0.4, while the mixtures with low sand fraction (sf≤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≤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.

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