Expansive soils can cause significant distress in pavement construction because of their swelling and shrinking nature. One such method to control this problem is addition of stabilising agent to the expansive soil. Millions of tonnes of quarry dust waste produced every year are not disposed properly, resulting in environmental pollution as well as serious health hazards. Hence, an experimental study including scanning electron microscope (SEM) analysis was taken up for possible replacement of quarry dust in the expansive clay solving a dual problem. The quarry dust percentage in expansive clay was varied from 10 to 25%. The laboratory tests were conducted to ascertain the index properties, compaction and swelling characteristics and cohesion properties of expansive clay–quarry dust mixes. The unconfined compressive strength as well as the maximum dry density increases up to 85% soil + 15% quarry dust proportion. Hence, the optimum dosage of the quarry dust is found to be 15%. The swell potential decreases from 14.73 to 7.17% at the optimum dosage. The performance evaluation for the use of quarry dust waste in subgrade stabilisation based on group index (GI) method has been discussed in this paper. From the cost analysis, it has been confirmed that there is a substantial savings in the cost of flexible pavement construction when the quarry dust stabilised expansive clay is used as a subgrade in place of expansive clay.

膨胀土由于其膨胀和收缩的性质而可能在路面施工中引起严重的困扰。控制该问题的一种这样的方法是向膨胀土壤中添加稳定剂。每年产生的数百万吨的采石场粉尘废物没有得到适当处置，导致环境污染以及严重的健康危害。因此，进行了包括扫描电子显微镜（SEM）分析在内的实验研究，以解决膨胀土中的采石场粉尘的替代问题，从而解决了双重问题。膨胀粘土中的采石场粉尘百分比在10％到25％之间变化。进行了实验室测试，以确定膨胀的粘土-采石场粉尘混合料的指数特性，压实和膨胀特性以及内聚性。无限制的抗压强度以及最大干密度增加了高达85％的土壤+ 15％的采石场粉尘比例。因此，发现采石场粉尘的最佳剂量为15％。在最佳剂量下，溶胀潜能从14.73降低到7.17％。本文讨论了基于群指数（GI）方法的采石场粉尘在路基稳定中的使用性能评估。从成本分析中可以证实，当采石场粉尘稳定的膨胀黏土代替膨胀黏土作为路基时，可大大节省柔性路面的建造成本。本文讨论了基于群指数（GI）方法的采石场粉尘在路基稳定中的使用性能评估。从成本分析中可以证实，当采石场粉尘稳定的膨胀黏土代替膨胀黏土作为路基时，可大大节省柔性路面的建造成本。本文讨论了基于群指数（GI）方法的采石场粉尘在路基稳定中的使用性能评估。从成本分析中可以证实，当采石场粉尘稳定的膨胀黏土代替膨胀黏土作为路基时，可大大节省柔性路面的建造成本。