Study on the development of"New Soil Stabilizer"that utili zed waste materials of oyster shell, plaster board and purified water sludge

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This study examines an importance of mechanical properties of lime stabilized soil with waste materials(crushed oyster shell, waste plasterboard and purified water sludge). In order to clarify the influence of the new soil stabilizer on mechanical properties, three kinds of soil samples mixed with the stabilizer at different mixture rate are investigated by a series of laboratory tests. The following conclusions are obtained from the present study : 1.The new lime stabilizer is suitable for better fine-grained soils than coarse-grained soils. However, even in coarse-grained soil, necessary strength can be secured by raising moderately the degree of compaction of the specimens. 2.A lot of ettringite(needle shaped crystal, 3CaO・Al2O3・3CaSO4・32H2O) were generated in the lime stabilized soils, and those were locking soil particles.