The foundation of any civil engineering structure rests on the soil, the strength and stability of civil engineering structures largely depends on the quality of soil on which they are built. However, weak soil can lead to settlement, particularly in the case of black cotton (BC) soil. BC soil is highly susceptible to volume charge when in contact with water. So, to address this issue, the properties of BC soil are improved by “soil stabilization”. The purpose of this study is to utilize Industrial waste Fly ash and to evaluate the geotechnical properties of clay soil mixed with different proportions of fly ash (FA). The test includes Index properties, unconfined compression strength (UCS), standard proctor test, and cyclic triaxial strength testing. The behavior of the damping ratio for treated and untreated soil was examined. The outcome demonstrates that the damping ratio decreases with increasing FA and is beneficial for foundation.