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Expansive Silt soil with low plasticity is encountered in most parts of Haryana state and the preliminary investigation shows that it has poor engineering properties. Traditional stabilizers like cement, lime and others have been efficient and effective in soil stabilization but their rising cost and negative impact to the environment has led to research into Polypropylene (PP) fiber to be used as an alternative in soil stabilization. The study investigated the properties of expansive silt soil with low plasticity when stabilized by Polypropylene (PP) fiber. The research covered grading test, Plasticity Index (PI), Liquid limit, Shear strength, Maximum dry density and Optimum moisture content, California Bearing Ratio (CBR). First particles size distribution was determined from grading test, secondly varying percentages (0.10%, 0.15%, 0.20%) of Polypropylene (PP) fiber was used to stabilize clay silt soil and then PI and CBR were determined. Two soil sample are taken in this study from the different place of the Jind districts of Haryana. The CBR was carried out using Maximum Dry Density (MDD) and Optimum Moisture Content (OMC) from graph of dry density against moisture content obtained from proctor test. The trend indicated that California Bearing Ratio increased with increase the percentage of Polypropylene (PP) fiber. The CBR value % are increased 5.54% to 8.66% after reinforcing the soil sample -1 with 0.20% Polypropylene (PP) fiber and in soil sample -2 it increased 5.61% to 8.22%.The shear strength of the soil sample -1 are increased 0.86kg/cm to 2.29kg/cm and in soil sample -2 it increased 0.82kg/cm to 1.76kg/cm .

A Study on Improving the Strength of Sub Grade Soil by using Polypropylene Fiber