In this paper an attempt has been made to highlight the effect of chemicals byproducts (Diammonium Phosphate (DAP) and Soda ash) on the plasticity and permeability characteristics of silty soil. Extensive geotechnical laboratory investigations have been done on the engineering behavior of silty soil from a chemical industry area. Experiments have been done to investigate the variation in the liquid limit, plastic limit and permeability characteristics of the soil due to the interaction of these industrial chemicals. It has been found that the soil is highly susceptible to contamination due to these chemicals and this fact should be kept in mind while planning and designing subsurface structures in soils in the proximity of chemical industry plants.
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