Soil stabilization using ground granulated blast furnace slag and 2% cement toward CBR and UCT value

Clay soil is microscopic to submicroscopic soil that forms due to the weathering of chemical components in rocks. Soil stabilization is the process of mixing soil with specific chemical compounds to improve soil qualities such as shear strength, settlement, volume stability, and permeability. The effect of adding different percentages of Ground Granulated Blast Furnace Slag (GGBFS) and 2% cement in each mixture as a stabilizing agent that can improve physical and mechanical properties in terms of California Bearing Ratio (CBR) and Unconfined Compression Test (UCT) value so that the clay soil can meet specific technical standards. The initial soil sample had a water content of 62.50 percent, a specific gravity of 2.59, a liquid limit (LL) of 60.82 percent, a plastic limit (PL) of 24.38 percent, and a plasticity index (IP) of 36.44 percent, according to the research. According to the USCS, the initial soil classification was Clay High Plasticity (CH), while according to AASHTO, it was A-7-6 (11). The actual soil’s unsoaked laboratory CBR value was 5.62 percent, and the original soil’s Unconfined Compression strength was 1.15 kg/cm2. With the addition of 35% GGBFS and 2% cement, the maximum unsoaked CBR value was 17.13 percent, and the unconfined compression strength was 2.52 kg/cm2 after a 14-day curing period.