Chemical stabilization is one of the oldest methods of stabilization of problematic soil. In recent days, it has
been investigated that addition of fibers will improve the ductility behavior of the soil there by reducing the
development of crack during shrinkage. Extensive study has been carried out on the stabilization of
expansive soils using various additives such as RBI, cement, flyash, industrial waste products etc., and also
with random inclusion of fibers such as coir, sisal, polyester fibers etc. Randomly oriented tensile inclusions
incorporated into soil to improve its load–deformation behaviour by interacting with the soil particles
mechanically through surface friction and Effect of Random Inclusion of Coir Fibers on Strength Behaviour of
RBI Treated Black Cotton Soil. This project describes the strength behavior of treated black cotton soil (BC
soil) reinforced with local fiber. The various percentage of RBI Grade-81 as 2%, 4%, 6% and 8% was used to
find out the optimum value of RBI Grade. local polymer has been randomly included into the RBI Grade
treated soil at four different percentages of local fiber content, i.e. 0.5%, 1% 1.5%, and 2% (by weight of soil).