Strengthening of BC soil by using fly ash and coir fiber ash as an additive in subgrade layers of pavement.

In India, black cotton soils and fine-grained clayey soils cover over 20% of the area. It is insufficient to have good quality material for civilization in the sense of roads and buildings. As a result, we must use several techniques to improve the current material. Any country's development is largely determined by its transportation system, trade, and other factors. Roads are one of the most important modes of transportation for connecting all of the villages and cities. Pavement design that is cost-effective saves money for countries. Road construction in most parts of the world is plagued by challenges caused by work sub grade dirt. Black cotton (BC) soil is a common example for weak sub grade. Because of the occurrence of the clay mineral montmorillonite, the clay mineral swells and shrinks significantly under wet and dry circumstances, causing vertical displacement in the pavement and, as a result, pavement failure. The overall weight on the pavement should be distributed evenly through the sub grade. Because the black cotton (BC) soil has a low bearing capacity, the sub grade's strength is enhanced by using locally accessible materials. In this Work, Analyzing the BC soil, Fly ash and coir Fiber ash. The present study uses Black Cotton (BC) soil from K.L University to test the engineering and physical properties of the soil by adding varying Proportion of Fly ash and coir fiber ash which improves the strength of the BC soil. The geotechnical properties of varying percentage of fly ash (0%, 2%, 5%, 10%, 15%, 20%, 25%) with soil, as a result, all of the investigated properties were decreased, with the exception of the CBR value and (OMC). And the geotechnical properties are varying percentage of Coir Fiber ash (0%, 10%, 20%, 30%, 40%) with soi. As a result, all of the investigated properties were decreased, with the exception of the CBR value and the (OMC). Variations of Geotechnical properties of Soil+Flyash+Coir fiber ash, the test results are OMC and CBR increases, MDD and FSI decreases with increasing percentages of additives. [ABSTRACT FROM AUTHOR]