USING RBI GRADE 81 A COMPARATIVE STUDY OF BLACK COTTON SOIL AND LATERITIC SOIL

Abstract

Expansive soils are causing number of damages to the structures particularly light buildings and pavements compare to other natural hazards like earthquake, floods, etc. Thus, worldwide these soils are considered to be problematic soils and pose several challenges for engineers. So, as to utilize these soils in an effective way, proper treatment to the soil is required. With the same intention, an attempt is made to modify engineering properties of black cotton soils by using RBI Grade 81. Lateritic soil contains more amounts of finer particles like medium sand, fine sand, silt and clay. It could be described as a red friable clay surface in a temperature countries, it could also described as a very hard homogenous vescular massive clinker lateritic soils as a group rather than well defined materials are most commonly found in a leached soils of humid tropic which is enriched in iron and aluminium. In order to fully appreciate the usefulness of lateritic clay soil, its problem (both in field and laboratory but as per project only laboratory experiments will be done) would have to be identified and useful solutions applied, like a soil stabilization, soil stabilization can be divided into two categories namely mechanical and chemical Mechanical stabilization is the blending of different grades of soils to obtain a required grade. Chemical stabilization is the blending of the natural soil with chemical agents. Several blending agents have been used to obtain different effects. The most commonly used agents are Portland cement; asphalt binders and lime, RBI grade 81 Atterberg’s limit, California Bearing Ratio (C.B.R.), Unconfined Compressive Strength (U.C.S.) tests has been carried out on the samples of soil and soil with stabilizers. Curing of samples is done for 0,3, days . RBI Grade 81 will be added to the soil in dry state in percentage (by weight) varying from 1% to 2% and the tests has been carried out for lateritic (red soil) and black cotton soil.. Black cotton soil and lateritic soil are such that they represent a wide range of variation in their properties