A Study on the Effect of Cement Treatment on the Behavior of EPS Composite Soils
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ORIGINAL PAPER
A Study on the Effect of Cement Treatment on the Behavior of EPS Composite Soils Behzad Rezaie . Reza Jamshidi Chenari
. Mehdi Veiskarami
Received: 15 March 2019 / Accepted: 18 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract A series of laboratory tests were conducted using a tall oedometer apparatus and a model retaining wall to evaluate the lateral pressure of EPSsand 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. Keywords EPS beads Cement Lateral pressure Oedometer test Retaining wall
B. Rezaie R. Jamshidi Chenari (&) Department of Civil Engineering, Faculty of Engineering, University of Guilan, Guilan, Iran e-mail: [email protected] M. Veiskarami School of Engineering, Shiraz University, Shiraz, Iran
1 Introduction Development of technology and the importance of reducing costs in civil engineering projects cause lightweight materials such as Expanded Polystyrene (EPS) to be utilized to improve the soil strength properties in geotechnical engineering ground. The potential advantages of EPS beads inclusion are the lightening of the backfill materials, reduction of construction costs, and reduction of lateral earth pressure on the retaining structure. It should be noted that EPS can be used as blocks or beads to presumably enhance the soil parameters in geotechnical engineering problems. In the context of the effect of the EPS inclusion in sand, Negussey and Jahanandish (1993) investigated various properties of the compounds and elaborated on the deformation and strength properties and the lateral earth pressure behavior of the EPS-soil composites. The results showed that the engineering properties of the EPS-soil composites can be studied using the existing characterization methods in geotechnical engineering. Liu et al. (2006) investigated the effect of different cement and EPS proportions on the mechanical behavior of filler materials and observed that the density of filler materials can be controlled by EPS. It was also found that the strength and stiffness of their composite can be controlled by the amount of cement, so a low-density material with high strength
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Geotech Geol Eng
characteristics can be obtained. Ertugrul and Trandafir (2013) studied the lateral earth pressure on flexible walls using EPS beads as fillers. They used shaking table experiments to investigate the behavior of such walls. The resul
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