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Compressibility Behaviour of Black Cotton Soil Admixed with Lime and Rice-Husk Ash

Dr.A.V.Narasihma rao1, B.Penchalaiah2, Dr.M.Chittranjan3, Dr.P.Ramesh

Black cotton soil covers about one-fifth of the area of our country. Owing to its undesirable engineering properties such as high swelling and shrinkage, the soil is not good either as foundation or embankment material. To make the best use of black cotton soil, its properties are to be modified to suit the requirements in any specific case by means of stabilization. Therefore, it is necessary to properly choose the stabilizer through careful investigation to improve the strength, compressibility and permeability characteristics. At the same time, the economics of the process of the stabilization should also be considered. In this paper the results obtained by studying the compressibility behavior of black cotton soil admixed with lime and rice-husk ash is presented. For the purpose of comparison similar studies have been carried out with admixtures such as lime and rice-husk separately