Improvement of the Bearing Capacity and Swelling of Ciampel Expansive Soil using Waste Foundry Sand

Abstract

Road construction on expansive soil often suffers damage because of large shrinkage properties due to changes in water content. This study aims to analyze the bearing capacity and swelling of expansive soils stabilized using WFS as an effort to find solutions for improving expansive soils by utilizing local materials based on industrial waste. In this study, the soil was mixed with waste foundry sand as an additive material with a concentration of 2.5%, 5%, 7.5%, and 10% of the soil dry weight. Tests carried out included Compaction, California Bearing Ratio, and Swelling Potential based on ASTM standards. The soil stabilized with 10% WFS showed a significant increase in CBR value with changes of 64.89% (unsoaked) and 438.69% (soaked) to the original soil CBR value. WFS 10% in the soil was able to suppress the expansion value of the expansive soil by 93.16% to the swelling value of the original soil. WFS content of 10% in the soil can be recommended as an expansive soil stabilization material because it can increase the bearing capacity of the soil and reduce the level of swelling of the soil.