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Type: Journal article
Title: Measuring and modeling proportion-dependent stress-strain behavior of EPS-sand mixture
Author: Deng, A.
Xiao, Y.
Citation: International Journal of Geomechanics, 2010; 10(6):214-222
Publisher: American Society of Civil Engineers
Issue Date: 2010
ISSN: 1532-3641
Statement of
An Deng and Yang Xiao
Abstract: A geofoam was produced by blending expanded polystyrene _EPS_ beads and sands in proportions. The formed mixtures, known as EPS-sands, were 26–63% lighter than general earth fills _e.g., sand_. Consolidated-drained _CD_ triaxial compression tests were conducted on EPS-sand mixture specimens to observe their stress-strain characteristics, specifically, the stress-strain responses in relation to the EPS contents _0.5, 1.5, and 2.5% by weight_ used in the mixtures and confining pressures _100, 200, 300 to 400 kPa_ loaded on the specimens. The EPS content and confining pressure were found to influence the stress-strain and volumetric strain behavior of the mixtures. Increasing EPS content led to decreased shear strength and increased volumetric strain. Increasing confining pressures enhanced the strength of the mixture. EPS-sand mixtures underwent a shear contraction throughout the CD tests. The optimum EPS bead content _i.e., the one reasonably balancing the unit weight, strength, and deformation_ was in the order of 0.5% by weight. EPS content dependent strain increment equations were derived by compromising Cam-clay and modified Cam-clay, and used to model the stress-strain characteristics of EPS-sand mixtures. The established equations were verified being able to depict the stress-strain observations of EPS-sand specimens, at least for the ranges of EPS contents and confinements considered in this study.
Keywords: EPS beads
Triaxial compression
Shear strength
Stress-strain behavior
Lightweight fills
Description: Special Issue: Modeling in Geotechnical Engineering for Design and Materials
Rights: © 2010 ASCE
DOI: 10.1061/(ASCE)GM.1943-5622.0000062
Appears in Collections:Aurora harvest 2
Civil and Environmental Engineering publications

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