This article evaluates the long-term wet-dry durability of lime, fly ash, and lime-fly ash slurry injection stabilization of expansive soil in the desiccated state. To achieve this objective, the expansive soil was compacted in large cylindrical test moulds and desiccated after making a central hole for slurry injection. Subsequently, the lime slurry/ fly ash slurry/ lime-fly ash slurry, prepared with the predetermined water-binder ratio, was injected into the desiccated expansive soil and cured for 28 days. The test results of lime and lime-fly ash slurry injected soils showed that there is improvement during the first wetting. However, at the end of four wet-dry cycles, the volumetric deformations of lime- and lime-fly ash slurry-treated soils increased to 10.6% and 13.6%, respectively, which are much lower than the volumetric deformation of untreated soil (30.7%). Additional analyses were also conducted to trace the growth of desiccation cracks of both untreated and treated soils. At the end of the third drying cycle, the total percentage of the cracks (surface cracks + annular gap) in lime slurry- and lime-fly ash slurry-treated soils reduced to 1.18% and 5.37% from the untreated soil value of 31.9%. The findings of the present study underline the positive impact of using lime, and lime in conjunction with fly ash for controlling the volume change behaviour of expansive soils. Furthermore, combination of lime and fly ash significantly reduces the consumption of lime, leading to sustainability in geotechnical practices.

来源平台：INDIAN GEOTECHNICAL JOURNAL