This study aims to stabilize expansive soil with RHA by 0%, 3%, 6% and 9%. The index properties test with existing soil included lean clay (CL). The existing soil was repaired by adding stabilizing material in the form of RHA as an added material. Based on the specific gravity test, it can be concluded that the addition of RHA reduced the value of specific gravity, made the plastic limit (PL), liquid limit (LL) and plasticity index (IP) decrease, which means that it could improve the properties of the existing physical soil. Standard Proctor Compaction Test (SPCT) with unsoaked method was conducted by giving 3 different number of blows, i.e. 10, 25, and 56 blows in 3 layers. The results show that the optimum moisture content (OMC) was almost constant, while the maximum dry density (MDD) slightly increased and most were added to an additional 6% of RHA. CBR test results show that the existing soil was 0.053 and after adding RHA, increased to 130% in the addition of 6% of RHA.

本研究旨在通过 0%、3%、6% 和 9% 的 RHA 稳定膨胀土。现有土壤的指标特性测试包括贫粘土（CL）。通过添加 RHA 形式的稳定材料作为添加材料来修复现有土壤。根据比重试验可以得出结论，RHA的加入降低了比重值，使塑限（PL）、液限（LL）和塑性指数（IP）降低，这意味着它可以提高现有物理土壤的性质。标准 Proctor 压实试验 (SPCT) 采用未浸泡法，通过 3 种不同的打击次数进行，即 3 层中的 10、25 和 56 次打击。结果表明，最佳水分含量（OMC）几乎是恒定的，而最大干密度 (MDD) 略有增加，并且大部分被添加到额外 6% 的 RHA 中。CBR试验结果表明，现有土壤为0.053，加入RHA后，在加入6%的RHA时增加到130%。