Pemanfaatan Limbah Beton dan Serbuk Batu Kapur sebagai Bahan Stabilisaasi Tanah Lunak

Soft clay soils often pose challenges in construction due to their low bearing capacity and high sensitivity to moisture content. To address this issue, this study stabilized soft clay using a mixture of 10% limestone powder and concrete waste at 5%, 10%, and 15% as environmentally friendly alternative materials. Laboratory tests—including specific gravity, grain size analysis, Atterberg limits, compaction, California Bearing Ratio (CBR), and swelling—were conducted after 14 days of curing. The results showed the optimal mix was 10% limestone powder and 15% concrete waste. In this variation, the plasticity index decreased by 85.90%, from 36.60% to 5.15%. The unsoaked CBR value increased by 435.38%, from 6.2% to 33.2%, while the soaked CBR value rose by 523.66%, from 4.65% to 29%. Swelling also decreased significantly by 89.18%, from 6.47% to 0.70%. These findings confirm that the material combination effectively improves the engineering properties of soft clay soils.