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In a country like India, a large area is covered with expansive soil. This widespread prevalence of expansive soil creates problems for the construction activities. Black cotton soil is very susceptible to detrimental volume changes with changes in moisture. The properties of black cotton soil can be modified by stabilizing the soil with the use of additives or by mechanical means. In this study, fly ash and coir waste are used as a stabilizing material to stabilize the expansive soil. The experimental work has been carried out to analyze the improvement in geotechnical properties of expansive soil mixed with fly ash and coir waste at varying percentages. The soil was first mixed with fly ash at 5%, 10%, 15%, 20%, 25% and 30% and with coir waste at 2.5% and 5% by weight of dry soil. The test results indicated that compaction and CBR characteristics of soil increased with increase in fly ash percentage up to 20%. The compaction results decreased on further addition of fly ash in a soil sample while the CBR results increased further. 2.5% and 5% coir was added to 20% fly ash and soil mix. The maximum values of dry density and CBR were obtained at 20% fly ash and 2.5% coir waste mixed soil sample.

Compaction and CBR Characteristics of Expansive Soil Stabilised with Fly Ash and Coir Waste