Stabilization of alluvial soil for subgrade using rice husk ash, sugarcane bagasse ash and cow dung ash for rural roads

This paper concerned with the stabilization of subgrade soil using different types of locally available materials such as rice husk ash (RHA), sugarcane bagasse ash (SCBA) and cow dung ash (CDA). The RHA, SCBA and CDA were mixed by partialreplacement of soil by weight in 0%, 2.5%, 5%, 7.5%, 10% and 12.5%. The natural soil was found as intermediate plastic clay which reduces the dry density and increases the optimum moisture content after stabilization. The trend of CBR and UCS are increasing and then decreasing, it indicates a peak point which shows an optimum content of ash (7.5). This study shows that there is a significant improvement in CBR, UCS and also able to control the volumetric change.