Impact of Rice Husk Ash on Soil Stability (Including Micro Level Investigation)

Objectives: In this study, the change in behavior of subgrade soil after apply rice husk ash which is an environmental pollutant was observed. Methods/Statistical Analysis: Some sample of subgrade soil was taken and mixed with various amount of rice husk ash (1%, 2%, 4%, 6%, 8% and 10%). Did some experimental tests like OMC, MDD, CBR to determine the changes on subgrade strength properties with RHA content also to study its impact in better way, did SEM and EDS tests of untreated soil as well as treated soil. Findings: From the experimental works it is observed that addition of rice husk ash shows increase in OMC value whereas decrease in MDD value and Upto 6% rice husk content CBR is increasing after that it start decreasing. In other hand from SEM and EDS test decrease in void ration and breaking of montmorillonite has observed. Applications/Improvements: Since mixing of rice husk ash with soil shows improvement in CBR value and reduces the void so it can be use for sub-base construction as it will reduce the thickness and cost of pavement.