Performance Analysis of Fly Ash Stabilized, Highly Saline Expansive Clays: A Case Study-Video

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The study evaluated Class F fly ash for stabilizing highly saline, unsaturated expansive soil from Bhavnagar, Gujarat. Fly ash contents of 10–25% were assessed, with 20% selected as the optimum dosage. At this level, electrical conductivity and salinity decreased, while unconfined compressive strength and California bearing ratio increased moderately with curing. CBR rose from 2.7% in untreated soil to 8.1% after 28 days, indicating suitability only for low-to-medium traffic subgrades. The authors conclude that fly ash improves soil properties but may not provide sufficient strength for demanding applications; future research should examine suction and swell pressure.

Keywords

Class F fly ash

saline expansive soil

soil stabilization

unconfined compressive strength

California bearing ratio