Subgrade strength is mostly affected by thickness of pavement, in Highway design.California Bearing Ratio (CBR) is the one of the method to determine the sub grade strength.CBR test is laborious and time consuming, hence a method is proposed for correlating CBR value with the LL, PL, SL, PI, OMC and MDD.In the present study, different soils samples (having 20<LL<70) were collected from different locations.Various laboratory tests including Atterberg limit, Specific Gravity, Gradation Analysis, CBR and compaction were performed on the samples.Various linear relationships between index properties and CBR of the samples were investigated using simple and multiple linear regression analysis and also predictive equation estimating CBR from the experimental index values were developed.
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Shirur et al. (2014) studied this question.