A method and composition for reducing the swelling capacity of clay-containing soil, thus lowering volume change in soil, and thus enhancing the stability of soil, particularly expansive clay soil, in order that it is sufficiently stable, such that roads, pavements and some types of buildings and other structures can be securely constructed thereon. The method also minimizes any swelling and/or shrinkage in the soil under any such structures due to the movement of moisture in the soil, and thus minimizes damage and deterioration caused to such structures due to the presence of too much, or too little, water in the soil thereunder.
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