Durability and strength improvement of clayshale using various stabilized materials

In Indonesia, the study of clayshale has begun to be widely discussed. Clayshale is well known as a degradable material. The process of degradability in clayshale shows the weakening of the shear strength. This clayshale characteristic leads to several failures in the geotechnical design. To avoid degradability, soil stabilization testing was carried out by using cement, lime and rice husk ash. In the soil stabilization study, the use of cement and lime is already common and effective for some type of problematic soil, but the cost of material production is expensive and not environmentally friendly. Rice husk ash as agricultural waste material has the potential as a stabilizing material because it is availability and reaction ability with lime as known pozzolanic reaction. From the test results, each mixture has different response and potency. Cement has better resistance to wetting and drying with a significant increase in unconfined compressive strength. Whereas the lime itself did not significantly increase durability and unconfined compressive strength, but the effect of rice husk ash to the soil-lime mixture increasing durability despite the reduction in unconfined compressive strength.