Abstract
A series of laboratory tests were conducted using a tall oedometer apparatus and a model retaining wall to evaluate the lateral pressure of EPS-sand composites and the effect of cement paste on the behavior of the composites both in at-rest and passive conditions. EPS beads were added to sand at different percentages by weight and at a variety of cement content range. The test results revealed that the factor K0 increases by addition of the EPS beads to the composites whereas the factor KP decreases. In addition, cement treatment results in a decrease in K0 and increase in KP factors. The justification behind such behavior is that the cement as a binder material, reduces the internal friction among soil particles which leads to such trends in increase and decrease of lateral earth pressure factors.
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