Stabilization of Soil Using Rice Husk Ash and Fly Ash

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A number of studies have been carried out to investigate the effect of addition of waste materials on modifying the properties of soil. The present study shows the modification of soil properties by adding locally available materials such as rice husk ash and fly ash. The cost of stabilization may be reduced by replacing by a good proportion of stabilizing agent using rice husk ash. The soil used in the present study is clay with high compressibility, which needs to be strengthened to minimize volume changes in the soil. The soil is stabilized by varying different percentages of rice husk ash and also fly ash. Observations are made for changes in compaction characteristics of the soil, unconfined compressive strength and California bearing ratio values of the soil. From the results, it is observed that the maximum dry density is increased with increase in percentages of rice husk ash, and the corresponding optimum moisture content is decreased and vice versa with the addition of fly ash to the soil. The optimum amount of rice husk ash and fly ash for improving the properties of the soil are discussed in detail.