The expansive soils have always presented various challenges for geotechnical and civil engineers due to their low bearing capacity and high swell-shrinkage characteristics. This study aims to utilize liming leather waste ash (LLWA) as a sole expansive soil stabilizer examining its effects on various engineering properties of soil such as consistency limits, compaction parameters, unconfined compressive strength (UCS), California bearing ratio (CBR), and swell parameters. The observations are also made on the curing effects on the strength parameters of the soil-additive mix. It was observed that the LLWA contains cementitious characteristics of lime and silica combined and can substantially reduce the plasticity and swell-shrink behavior of the soil and improve its strength and bearing characteristics. The UCS and CBR values have also shown multifold increase post curing with UCS and soaked CBR escalating by 278% and 387% respectively. The test results are further explained through the microstructure study which confirms the mineralogical transformation and cementation of soil particles. A one-dimensional rainfall-simulated leachate study has been carried out over a pavement model at the end to access the possible impact of ash treatment on the water table.

由于膨胀土的低承载力和高膨胀收缩特性，它们一直对岩土工程和土木工程师提出各种挑战。这项研究旨在利用石灰皮革废灰（LLWA）作为唯一的膨胀土壤稳定剂，研究其对土壤各种工程特性的影响，例如稠度极限，压实参数，无侧限抗压强度（UCS），加利福尼亚承载比（CBR）和膨胀参数。还观察了固化对土壤添加剂混合物强度参数的影响。观察到，LLWA包含石灰和二氧化硅的胶结特性，可以显着降低土壤的可塑性和溶胀特性，并提高其强度和承载特性。UCS和CBR值还显示，使用UCS固化后的CBR和浸泡后的CBR分别增加了278倍和387％。通过微观结构研究进一步解释了测试结果，该研究证实了土壤颗粒的矿物学转变和胶结作用。最后在路面模型上进行了一维降雨模拟渗滤液研究，以了解灰分处理对地下水位的可能影响。