Abstract
Soil is one of the most important materials in construction. Soil stabilization is an attempt to increase condition of soil that have poor engineering properties. Soil stabilization is also a mixture of soil with certain stabilizing agents to increase the engineering properties of the soil to attain technical requirements. This research used calcium hydroxide as a stabilizing material. The study purposes were to improve the engineering properties of clay due to the addition of 3% - 30% calcium hydroxide, Ca(OH)2. The clay soil was classified as A-7-6 (9) based on the AASHTO classification system and was classified as CL (Clay – Low Plasticity) based on USCS. The unsoaked California Bearing Ratio (CBR)of original soil was 6.29%. Meanwhile, the Unconfined Compression Test (UCT) of original soil was 1.42 kg/cm2. The study showed that the addition of calcium hydroxide increased the engineering properties of clay soil. The unsoaked CBR reached the maximum value of 11.46% at a variation of 12% calcium carbonate. The UCT also gained the maximum value of 3.12kg/cm2 at a variation of 12% calcium hydroxide.
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