Several techniques of soil stabilization are available to improve the behavior of many types of soil. The addition of cement to soils have proved a significant effect on the geotechnical properties of treated soils. In this study, an artificial clayey sand soil samples were prepared by mixing 20% kaolin clay of fine sand. Initially, compaction tests were conducted on soil mixture to study the effect of kaolin addition on maximum dry density, optimum moisture content of mixed soil at a relative density of 55%. The mixed soils were improved by cement. Then ,a series of unconfined compression tests were performed to clarify the performance of improved soil with different cement contents at the optimum water content of each cement content ,and the samples examined after two hours from preparation, and curing period of 7 days and 14 day. Results of compaction test indicate that adding kaolin increasing maximum dry density and moisture content. Tests results show that addition of cement to soil mixture increased stiffness and unconfined compression strength (UCS), and leading to a brittle behavior.
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