Amelioration of Expansive Clay Using Recycled Bassanite

Abstract

Solid waste management is a serious setback over the world. Therefore, reduction, reuse and recycling of waste have become major issue in recent days. The use of recycled bassanite in ground improvement projects is initiated recently in Japan to eliminate the huge quantities of gypsum wastes. The use of recycled bassanite has a positive effect on the environment and economy. It has challenges like release of fluorine more than the standard limits results in contaminate soil. This paper represents the effect of bassanite on clay stabilized soil by taking in consideration of the compressive strength and release of fluorine. Test results showed that the addition of bassanite had a significant effect on the improvement of compressive strength by increasing the amount of bassanite. The release of fluorine increases with the amount of bassanite in soil mixture, and it had a negative effect on the improvement of strength and consuming the amount of admixture. Recycled bassanite produced from gypsum wastes had a potential to be used as a stabilizer material for expansive clay soil and meets the standards of environment.