Impact on the CBR Behaviour of Soil Using Rice Husk Ash and Sugarcane Bagasse Ash

The objective of this work is to utilize the effectiveness of Rice Husk Ash (RHA) & SCBA material to enhance the properties of natural soil used for subgrade material in pavement. The quality of a flexible pavement depends on the strength of its sub-grade soil. In view of the above the present investigation has been carried out with rice husk ash & SCBA (Sugarcane Bagasse Ash) mixed individually and also in combination with locally available natural soil in different proportions stepped concentration of 5%, 10%, 15%, 20%, 25% and 30% by dry weight of the soil individually are used to stabilized of Natural Soil (CL) and to evaluate its properties like Grain Size Distribution, LL, PL, PI, OMC, MDD, CBR and Swelling Pressure. The test results indicate that the addition of RHA enhances the percentage of grain size distribution, but with addition of RHA till 10% the LL, PL, PI and swelling pressure decreases, while these parameters further increases in this limit beyond i.e. 10% to 30% of RHA while enhancement is observed above 20% to 30%, Specific Gravity and Maximum Dry Density (MDD) decrease with addition of RHA, for all percentage values, whereas OMC increases in each material. The CBR value increases with the addition of RHA till 10%, while it decreases beyond the limit 10% to 30% with addition of RHA. the addition of BA enhances the percentage of partial size distribution, but with addition of BA till 20% the L.L, PL, PI and swelling pressure decreases, while these parameters further increases in this limit beyond i.e. 20% to 30% of BA, Specific Gravity and MDD decrease with addition of BA, for all percentage values, whereas optimum moisture content increases in each material. The CBR value increases with addition of BA till 20%, the CBR value increases and it is decreases with further addition of BA beyond 20% to 30% for both condition (soaked and Unsoaked).