Expansive clay is a clay that is prone to large volume changes that are directly related to changes in water content. Clay is a naturally occurring material composed primarily of fine-grained Minerals which show plasticity through a variable range of Water content, and Water content or moisture content is the quantity of Water contained in a material such as Soil (called soil moisture) rock, Mitigation of the effects of expansive clay on structures built in areas with expansive clays is a major challenge in geotechnical engineering. Geotechnical engineering is the branch of Civil engineering concerned with the engineering behavior of earth materials