American Society of Civil Engineers


Density and Strength Properties of Sand-Expanded Polystyrene Beads Mixture


by Wei Zhu, (Prof., State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098), Mingdong Li, (Ph.D. Student, Geotechnical Institute, Hohai University, Nanjing 210098, China), Chunlei Zhang, (Dr., College of Environmental Science and Engineering, Hohai University, Nanjing 210098, China), and Gan Zhao, (Ph.D. Student, Geotechnical Institute, Hohai University, Nanjing 210098, China)
Section: Mechanical and Chemical Soil Behavior, pp. 36-43, (doi:  http://dx.doi.org/10.1061/40972(311)5)

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Document type: Conference Proceeding Paper
Part of: GeoCongress 2008: Characterization, Monitoring, and Modeling of GeoSystems
Abstract: Expanded Polystyrene (EPS) beads was utilized to develop a new geotechnical material, sand-EPS beads-mixture (SEM). Density tests, direct shear tests and compression tests were conducted to evaluate the density and strength properties of the SEM. Direct shear tests were conducted under 4 different vertical stresses (32.7, 50, 75, 100kPa). The effect of gravimetric water content (3.25, 6.5, 9.75, 13, and 16.25%), volumetric EPS beads content (0, 33, 50, 60, 67, and 100%) and preload pressure (0, 100, 200, 300, 400kPa) on properties of the SEM were studied. The results showed that: (1) water is necessary for preparing specimens, but has no distinct effect on dry density and shear strength of the SEM; (2) dry density of the SEM decreases linearly with volumetric EPS beads content, but increases with preload pressure; and (3) the shear strength of the SEM changes little with volumetric EPS beads content and gravimetric water content, but increases with preload pressure.


ASCE Subject Headings:
Earth pressure
Geosynthetics
Sand (material)