Impact of Quicklime and Fly Ash on the Geotechnical Properties of Expansive Clay

Severe damages can occur on civil engineering structures and infrastructure including roads, channels, houses, sidewalks, and driveways if built on expansive soils. In this study to limit the expansive soil impacts on roads, quicklime and class F fly ash were employed as potential stabilisers in enhancing the engineering properties of expansive soils. The samples were prepared by integrating artificial soils combined with a mixture of quicklime-fly ash at a ratio of 1:3. Various contents of quicklime-fly ash were applied on soil samples, composed of 40% bentonite (B) and 60% kaolin (K). Sample properties were measured at 3, 7, and 28 days of curing time. Moreover, another set of soil samples were prepared containing 20% B and 80% K to study the effect of bentonite content on the soil mechanical properties of the stabilised soil.