Improvement of soil in site with admixtures defined as stabilization or improvement.Main ideas of stabilization are increase of strength, decrease of compressibility, increase of shear strength and bearing capacity. By adding chemical admixture to soil engineering properties of soil improved. In stabilization by chemical method reaction between soil and admixture causes that strength structure formed. In this this research, chemical admixture like lime, cement, micro silica and bentonite are used. By increase the static compaction(compression) in samples, the unconfined compression strength increase.In cementy sample by increase the water- cement ratio ,unconfined strength decrease and unlike in lime sample strength increase. Also in this research microsilica used, microsilica can improve the soil special sulfated soil. Microsopic analysis used to define the mineralogy and morphology changes before and after stabilization of soil to explain the stabilization.
