Abstract—Black cotton soil is one of the major regional soil deposits in India, covering an area of about 3.0 lakh sq. km black cotton soils in India are highly problematic, extensive research is going to find the solutions to black cotton soil. Use of waste materials in road construction has been in vogue in India for quite some time. This is particularly necessitated by the problems of disposal associated with it. Otherwise, these materials would cause problems to the environment. In this research paper result CBR value of Black cotton soil use waste copper slag. Copper slag is one waste byproduct produced by The Sterlite Industries-I Ltd. New Delhi (SIIL), India. the production of copper slag is 120-130 lakh ton per annum.copper producing units in India leave thousands of tons of copper slag as waste every day, granulated copper slag is more porous and, therefore has particle size equal to that of coarse sand. the previous research studies carried out by various researchers on utilization of copper slag in clayey soil results for good soil stabilizations 2% to 30%. Further we use this ratio for black cotton soil. We use copper slag to determine CBR values of black cotton soil. The paper presents the results of high value of soaked CBR (4 days) 5.43% in combination of 72% BC soil and 28% copper slag and further, it tends to decrease.
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