The effects of carbide lime on the physical and engineering properties of a selected silty soil were investigated. A predetermined fraction of lime together with a fixed percentage (25%) of fly ash was thoroughly mixed with the cleaned and dried soil. Adequate water was added to provide total reaction and hydration. The supersaturated dry curing period was up to 30 days. Index properties and specific gravity of the treated and untreated samples were determined. It was observed that there was a significant improvement in soil plasticity while the specific gravity decreased with the increase of lime content. Unconfined compression and un-consolidated undrained triaxial tests were carried out to evaluate the effects of initial and pozzolanic reactions causing overall changes in physical and engineering properties within the soil samples. Strength increased significantly with the increase of lime content and curing period for a particular amount of fly ash.
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