Effects of Calcium Sulfate on Swelling Potential of an Expansive Clay

摘要

The unique chemical features of calcium sulfate are largely manifested by its phase transformation to the reversible hydration-dehydration reaction. Due to the harsh climatic and envi- ronmental conditions in eastern Saudi Arabia, such phase changes add to the potential swelling hazards of local expansive clays. The adsorption of water by expansive soils and the hydration of anhy- drite to gypsum are the sources of much damage to fundations throughout the world.