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Loess is among the most collapsible soils, which shows high stiffness and strength in its natural moisture content. Nevertheless, as it reaches to the critical moisture, under certain loading, its volume decreases rapidly and collapse of the soil takes place. Therefore, the bearing capacity of any foundation of structures built on such a soil is reduced and relatively abrupt and excessive settlements lead to drastic deformations and failures in that structure. The paper presented herein describes a laboratory study to evaluate and compare the deformation and strength characteristics of Loessial soils stabilized by Nano-Silica, Lime, and Portland Cement. In this research, different percentages of each stabilizer along with different temporal conditions are examined. The results show that the rate to which the soil strength and the resistance against collapse are increased has a significant dependency to the curing time and the amount of stabilizers used. On the basis of unconfined compressive strength test results, an optimum amount for each stabilizer and associated curing time is determined and presented in this paper.
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