AN EXPERIMENTAL STUDY ON THE BEHAVIOR OF RICE HUSK ASH, POLYPROPYLENE FIBER AND BAMBOO LEAF ASH TREATED ON EXPANSIVE SOIL SUBGRADE

This experimental work is investigate the behavior of rice husk ash, polypropylene fiber and bamboo leaf ash on expansive soil (black cotton soil). In this expansive soil superstructure with heavy load like multi storied building, dam, bridges, retaining stricture, pavement etc are damaged by settlement of soil (expansive soil).they make uneven and uniform small and deep settlement .the settlement causes crack, uniform settlement, tipping settlement, differential settlement. In experimental study black cotton soil mix with different % of rice husk ash 4% 6% 8% and mix with polypropylene fiber 0.5% 0.75% 1% . For bamboo leaf ash also 4% 6% 8% mix with black cotton soil. Engineering properties of black cotton soil liquid limit, plastic limit, shrinkage limit, and differential free swell test are performed. The result show black cotton soil with various % of Rice husk ash liquid limit is decreases and plastic limit also decreases with increasing % of RHA. Shrinkage limit of black cotton soil is increasing with increasing % of RHA in black cotton soil. For polypropylene fiber Black cotton soil mix with % of 0.5% 0.75% 1% liquid limit of black cotton soil is decreases and plastic limit also decreasing. For shrinkage limit is increases when increasing % of PPF in black cotton soil. DFS value is decreasing with increasing % of RHA PPF and BLA in black cotton soil.