Stabilization of Black Cotton Soil using Lime and Phosphogypsum

Expansive soilsareproblematicsoilsforCivilEngineers. Black cotton (BC) soils possess lowstrength and high compressibility, due to these propertiesblack cotton soils are considered to be challenging one for analysis. To achieve desiredpropertiesofsoilforconstructionpurposetheseblackcotton soil must be enhanced to meet its requirement. To modify the properties ofblack cotton soils, many treatment methods are there. In this paper an attempt has been made to improve the properties of black cotton soil by using industrial waste through stabilization method. By stabilizing the soilproperties are enhanced and make it suitable for subgrade construction.Inthiswork,thecombined effectofLimeandPhosphogypsum(PG) on compaction characteristics, Atterberg'sLimit,Unconfined CompressiveStrength(UCS)fororiginalsoil,CaliforniaBearingRatio(CBR)anddirect shear Test of a black cotton soil with percentagevarying of Lime and Phosphogypsum was carried out. The soil sampleswere tested for tri-axial compression test and CBR tests were carried out after 4 days curing period. From the results, ithas been inferred that the black cotton soil treated with Lime andPhosphogypsuminthepercentagesof(4:4)hasbetterstrength characteristics. Hence, it may be concluded that Lime and Phosphogypsum canbeusedforstabilizationofblackcottonsoilsforpavement subgrade