EFFECT OF RICE HUSK ASH ON THE PROPERTIES OF EXPANSIVE SOILS

Abstract

This studies the variations in the index and engineering properties of clay on usage of rice husk ash as stabilizing agent. A number of laboratory experiments were conducted on clay soils and RHA modified soil mixes. Attempts to study the unpredictable behaviour of the expansive soil and through research on how to bring these problems under control form the backdrop for this project work. Laboratory experiments are conducted to check the engineering properties of a naturally available expansive soil before and after stabilization. Stabilized results of expensive soils are compared to give the conclusion that can find expansive soil problems. The major agricultural product from paddy is rice husk which produces 40kN of rice and 10kN husk every year. The ash which is made by burning of rice husk is used as stabilization agent. The weight of the rice husk ash is very light which can be carried out easily.The disposal of Rice Husks is a big problem and open heap is not acceptable on environmental grounds, and so majority of husk currently going into landfills. Research has been conducted to determine the potential use by burning the husk into ashes. These rice husk ashes have high content of silica if burnt in controlled manner. Hence it can be mixed with expansive soils to improve the properties.