Study of Improvement of Clayey Soil by Using Red mud and GGBS in Subgrade and Minimize the Thickness of Flexible Pavement

Soil stabilization methods are commonly used in highway projects where high strength of sub-soil is required. In physical and chemical stabilization, an optimum amount of Red mud and GGBS is mixed with the soil to improve its quality. A practical and generally accepted approach is used to determine the optimum amount of additive to be added to the soil to get maximum efficiency. In this work, an attempt has been made to carry out experimental work, based on various results with different numbers of additives. The value of CBR increased from 8.70%% to 12.72%for (15% of Red mud + 0-6% GGBS) used and then decreased in the soil sample in un-soaked conditions. The value of CBR increased from 2.83% to 8.87% for (15% of Red mud + 0-6% GGBS) used and then decreased in the soil sample in 4days-soaked conditions. Pavement design AT CBR value of 3%:- Total pavement thickness for CBR 3 % and traffic 5.5 MSA from IRC:37 2001 PLATE 1 = 679 mm. AT CBR value of 9%: - Total pavement thickness for CBR 9% and traffic 5.5 MSA from IRC:37 2001 PLATE 1 = 481.5 mm.