Effect of fly ash on the consistency of black cotton soil

Abstract

This research investigates the effect of fly ash on the consistency of black cotton (BC) soil. The study aims to improve the soil's plasticity characteristics by incorporating different percentages of fly ash and examining the results through the Atterberg limits test. Fly ash procured from the Koradi thermal power station, categorized as F-type, was added to BC soil in proportions of 5%, 10%, 15%, and 20%. The soil samples underwent testing before and after adding fly ash, followed by  7-day and 14-day curing periods. The results showed a notable enhancement in the soil's plasticity index (PI) and Shrinkage Index with the increasing percentage of fly ash. The most notable enhancement was observed at 20% fly ash content after 14 days of curing, where the plasticity index improved substantially. This improvement indicates that adding fly ash effectively stabilizes black cotton soil, enhancing its suitability for construction and geotechnical applications. The study highlights the potential of utilizing industrial by-products like fly ash to improve problematic soils, promoting sustainable construction practices and efficient waste management.