In highway pavement design, California Bearing Ratio (CBR) test measures:
ATensile strength of subgrade soil
BRelative shear resistance of subgrade soil under controlled penetration
CModulus of subgrade reaction (K-value)
DAbrasion resistance of aggregate
Explanation
CBR test evaluates relative shear strength of subgrade soil by measuring force required to push a 50 mm diameter plunger at 1.25 mm/min into soil compared to standard crushed stone.
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