Stablization of expansive soil

Author: 
Neelam Phougat

Expansive soil, also called shrink-swell soil, extensively exists in arid and semiarid regions of the world and cause great damage to infrastructure and buildings costing a lot of money to repair every year [1,2]. Depending upon changes in water content of the soil, expansive soil having high amounts of clay particles is prone to volume changes (swelling and shrinking) of up to thirty percent or more. Moisture content of these soils can be changed due to drought, rain, rise and fall in the ground water table, leakage of sewer lines, plumbing leaks, evapo-transpiration of vegetation, irrigation etc. Soils with smectite clay minerals, including montmorillonite and bentonite can adsorb very large amount of water between its crystalline sheets and therefore have the most dramatic shrink-swell capacity.

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