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Journal of Applied Sciences
Year: 2011  |  Volume: 11  |  Issue: 2  |  Page No.: 330 - 335

Interaction of Lime and Sodium Chloride in a Low Plasticity Fine Grain Soils

M.H. Davoudi and E. Kabir    

Abstract: In this research, the effect of sodium chloride on the soil strengthening by lime is examined by a series of laboratory tests. In the process of strengthening and stabilizing salty soils by lime, the naturally existing salt interferes in the lime-soil reactions which may result in either intensification or mitigation of the process result. CL-ML soil samples were mixed with 2, 4, 6 and 8% of lime and 1, 2, 3 and 5% of sodium chloride. After being compacted and cured for a period of 7 or 28 days, their resistances were measured by running uniaxial compressive test. The results reveal that the presence of sodium chloride in a soil-lime mixture improves the compressive strength of the mixture. This increase is due to an increase in pH of the media by sodium chloride and thus an increase in the dissolubility of silicates to interact with calcium and create pozzolanic process to produce cement. Also a calcium-sodium silicate gel improves the cementation faster than a calcium silicate gel. Also it was found that the positive effect of salt on lime-soil mixture resistance is more pronounced when the percentage of lime is low.

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