The California Bearing Ratio (CBR) test on subgrade soil is used to evaluate:
ATensile strength of concrete base
BShear strength and thickness design of flexible pavements
CFlexural strength of rigid pavement slabs
DOptimum moisture content of subgrade
Explanation
The CBR test measures force per unit area required to penetrate a soil mass with a standard circular piston at 1.25 mm/min. CBR values directly correlate with subgrade shear strength and determine pavement thickness in empirical flexible pavement design.
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