Civil Engineering MCQAE Level Civil Engineering
The California Bearing Ratio (CBR) value at 2.5 mm penetration of a soil is determined by dividing the load to achieve 2.5 mm penetration by:
Soil MechanicsField CBR TestMEDIUM
Choose the correct answer
A
1370 kgf (standard load for crushed stone)
B
680 kgf
C
1000 kgf
D
2055 kgf
Correct Answer
A. 1370 kgf (standard load for crushed stone)
Why is this the answer?
CBR (at 2.5 mm) = (test load at 2.5 mm penetration) / 1370 kgf × 100%. The standard load at 2.5 mm = 1370 kgf (13.44 kN) for crushed stone base. At 5 mm: standard load = 2055 kgf.
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