CBR (California Bearing Ratio) test is used to evaluate the:
Choose the correct answer
Skid resistance of road surface
Bearing strength of subgrade/sub-base for pavement design
Compressive strength of concrete pavement
Traffic volume
Correct Answer
B. Bearing strength of subgrade/sub-base for pavement design
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CBR = (load on standard area to cause 2.5 mm penetration in test soil) / (load for same penetration in standard crushed stone) × 100%. Measures subgrade / sub-base strength for flexible pavement thickness design. High CBR → thinner pavement. CBR > 80%: use as WBM sub-base; CBR < 5%: very poor subgrade needing stabilisation.
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