Comparative Study on Stabilisation of Bentonite Clay Using Municipal Incinerated Bottom Ash and Fly Ash

The major destructions in Civil Engineering structures are due to the expansive soils. To prevent severe effects on infrastructural elements like roads, buildings, dams, embankments, etc., expansive soil is stabilised. A sustainable approach of stabilising expansive soil especially bentonite clay using Municipal Incinerated Bottom Ash (MIBA) and fly ash from the municipal incinerator plant has been presented in this study work. The laboratory investigations are carried out to determine the geotechnical characteristics of stabilised soil through its index and engineering properties. Further, the results are compared for MIBA and fly ash treated soil which concludes that bentonite treated with fly ash at 30% performs better with higher stress values. The maximum stress value is obtained for bentonite with 30% MIBA (270.74 kPa) at a curing phase of 14 days. On the accumulation of further percentage, the stress values are decreasing. In case of fly ash, the results are observed to be increasing with increasing days of curing, and the extreme stress value is found for bentonite with 30% fly ash (311.24 kPa) at a curing period of 14 days.