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Soil as the basis for strengthening the building structure must have a high bearing capacity and shear strength. Soil is useful as a building material in a variety of civil engineering and mining works. The main function of soil is to support the foundation of a building requiring stable soil conditions, poor soil conditions need to be engineered by changing or adding elements or materials that can change physical and mechanical properties by stabilizing the soil. Stabilization is an action taken to improve the physical and mechanical properties of the soil to increase the bearing capacity of the soil, water content, cohesion and internal friction angle. Soil stabilization that can be done, one of which is adding chemicals by adding extinguished lime (Ca(OH)2. Lime is a material that contains substances that are able to neutralize the swelling and shrinkage properties and increase the strength and durability of the soil, especially in clay soils with parameters of soil shear strength (ϕ) and cohesion (c) will increase and change the physical properties of the soil related to the volume of the optimum water content. The research was conducted by mixing extinguished lime with clay at 4%, 6%, 8%, 10%, and 12% and the direct shear strength test time was based on 3, 6, 9, and 12 days. Clay soil used as a mixture of quenched lime (Ca(OH)2) has a natural density value of 2.05 gr/cm3, 37.4% porosity, and a void ratio value of 0.6. The optimum water content value obtained in clay soil is 17.26% at a dry density condition of 2.38 gr/cm3. The effect of adding lime and a long test time on the optimum cohesion value occurred in the addition of 6% lime with a value of 0.15 MPa while the effect of adding lime and soil test time on the optimum internal friction angle value occurred in the addition of 12% lime with the highest value of 27.1o. [ABSTRACT FROM AUTHOR]