Question: A soil subgrade sample was tested using Standard California Bearing Ratio apparatus. At 2 . 5 mm penetration the proving ring reading for measuring load

A soil subgrade sample was tested using Standard California Bearing Ratio
apparatus. At 2.5 mm penetration the proving ring reading for measuring load is 62.25 kgf
& at 5.0 mm penetration the proving ring reading is 84.37 kgf. Taking the standard
assumption & procedure regarding the load penetration curve, Determine the design CBR
value of the subgrade sample and also explain the procedure to calculate the 90th percentile
CBR for the design of flexible pavements as per IRC:37-2018 guidelines.

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