Clayshale Stabilization Using Liquid Calcium Carbonate to Increase Soil Shear Strength

Abstract

Abstract Clayshale is a material that often causes various stability and bearing capacity problems in geotechnical engineering structures because it tends to weather and slake relatively quickly. This causes clayshale to be often not used during construction. Therefore, it is necessary to stabilize the clayshale. This study aims to determine the effect of adding variations in the levels of liquid calcium carbonate to the clayshale shear parameters. Physical and mechanical properties were tested on the original remoulded clayshale and samples with additional variations of 1M and 2M liquid CaCO3. Based on laboratory testing, the original clayshale samples had LL values of 37.9%, PL 14.6%, IP 23.3%, Gs 2.617, OMC 13.67%, γdry 1.762 gr/cm3. The addition of CaCO3 has been proven to increase the Gs value and reduce the plasticity index of the clayshale. After the Triaxial UU test, the clayshale sample in remoulded condition has a c value of 0.171 kg/cm2 and φ 8.33°. While the clayshale sample with 2M CaCO3 substitution as much as 80% OMC value which has been cured for three days increased the most optimum c and φ values, respectively 0.289 kg/cm2 and 11.13°. This shows that the addition of liquid CaCO3 can be used as a clayshale stabilization agent because it can increase the value of the shear parameter and improve the clayshale properties.