Waste disposal has become a serious problem because of lack of locals for the implantation of land-fill and it should be solved urgently. It is therefore desirable to develop an effective method of geotech-nical treatment to use waste materials. The waste expanded polystyrene (EPS), which is widely obtained in Japan, may be utilized as a promising lightweight material by mixing with soil. The aim of this study is to investigate the compaction, direct shear and permeability properties of a mixture of sand and heat compressed and crushed EPS (HCCE) for possible use as a light weight fill material. The test results showed that the HCCE material was effective to decrease the self-weight of soil and also to increase its shear strength and permeability. In addition, the sand mixed with the HCCE material was found to be a useful fill material on soft ground based on simple slope stability analysis.
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