Among various types of soil (according to particle size) clayey soil has tendency to show problems like swelling and
shrinking when moisture variation occurs .This property of clayey soil is because of presence of minerals like montmorinollite.
These minerals have hydrogen bonds in between their particles. The swelling and shrinking property of this soil results damages
to the structures. So it’s a major concern for Geotechnical engineers to improve this property of expansive soil and make soil
durable and strong for long run. Gypsum has been used as a conditioner in agriculture, it makes soil workable. In this paper
gypsum hemihydrate (POP) (Ca2So4.1.5H2O) has been taken as a stabilizer to improve the property of swelling and cement to
improve the strength of the soil and improve the durability of gypsum hemihydrate in wet environment. Different quantities of
gypsum hemihydrates like 3%, 5%, 7% and 10% and a small amount of cement 1% and 3% by dry weight of soil added to clayey
soil and compacted to optimum
