Question

California Bearing Ratio (CBR) is a

• A. measure to indicate the relative strengths of paving materials
• B. measure of shear strength under lateral confinement
• C. measure of soil strength
• D. method of soil identification

Answer 1

The correct option is A measure to indicate the relative strengths of paving materials

CBR test is used to evaluate the stability of soil subgrade and other flexible pavement materials. It is an arbitrary strength test and hence can not be used to evaluate the shear strength parameters. In essence it is a measure to indicate relative strengths of paving materials and not the absolute strength.