Many roads are damaged due to heavy tonnage vehicles or because the road foundation is in the form of expansive clay. The rescue effort is to use beach sand (sea sand) for stabilization / repair of road sub-grade in the form of clay. This research using experimental method to carried out by repairing/stabilizing soil clay by mixing beach sand. Sand content varies from 60%, 80%, to 100%. Mixed soil was compacted at optimum water content, then tested by CBR test and Swelling test. The results of this study are CBR (strong-support) and Swelling (development) values. Mixing: 60%, 70%, 80%, 90%, 100% beach sand against clay, able to increase the CBR value by a row: 7.3%; 9.6%; 11.8%; 18.5%; 25.2% (Lendah clay, Unsoaked), and 6.2%; 9.8%; 13.4%; 19.3%; 25.2% (Lendah clay, Soaked). The Prambanan clay, the yield is slightly smaller than the Lendah clay. The Swelling value is: 0.095%; 0.055%; 0.015%; - 0.107%; -0.229% (Lendah clay), almost the same as Prambanan clay. Here it can be seen that mixing beach sand will always increase the CBR value, but if the percentage of sand is too much, the soil will easily collapse (negative swelling). The conclusion is that in the clay mixture with beach sand the optimum percentage of beach sand will be 85%.

许多道路由于吨位重的车辆或由于道路基础是膨胀粘土的形式而遭到破坏。救援工作是使用海滩沙（海沙）以粘土的形式稳定/修复道路路基。本研究采用实验方法通过混合沙滩沙修复/稳定土壤粘土进行。沙子含量从 60%、80% 到 100% 不等。混合土在最佳含水量下压实，然后进行CBR试验和膨胀试验。这项研究的结果是 CBR（强支持）和膨胀（发展）值。混合：60%、70%、80%、90%、100%沙滩沙对粘土，可连续增加CBR值：7.3%；9.6%；11.8%；18.5%；25.2%（Lendah 粘土，未浸泡）和 6.2%；9.8%；13.4%；19.3%；25.2%（Lendah 粘土，浸泡）。普兰巴南粘土，产量略小于兰达粘土。溶胀值为：0.095%；0.055%；0.015%；- 0.107%；-0.229%（Lendah 粘土），与 Prambanan 粘土几乎相同。在这里可以看出，混合沙滩沙总是会增加CBR值，但是如果沙子的百分比太多，土壤很容易塌陷（负膨胀）。结论是，在粘土与沙滩沙的混合物中，沙滩沙的最佳百分比为 85%。