Experimental Study on Design of Flexible Pavement Using CBR Method

As per IRC recommendation, California Bearing Ratio (CBR) value of sub grade is used for design of flexible pavements. California Bearing Ratio (CBR) value is an important soil parameter for design of flexible pavements. CBR value of soil may depend on many factors like maximum dry density (MDD), Optimum moisture content (OMC), Liquid limit (LL), Plastic limit (PL), Plasticity index (PI), Type of soil, etc. And also CBR value of the soil is affected by the soaked and unsoaked condition of the soil, the results obtained by these tests are used with the empirical curves determined the thickness of pavement and it's component layers. Sub grade soil is an essential component for design of both flexible and rigid pavement structure, laboratory investigation of sub grade strength parameter as CBR beneficial for design of flexible pavement. This study considers the use of CBR, Unconfined compressive strength (UCS). In this paper the attempts have been made to seek the value of CBR of soil sample, soil sample allowing with fly ash.