Civil Engineering MCQJE Level Civil Engineering
The minimum clear cover for reinforcement in a slab (mild exposure) as per IS 456 is:
RCCRCCEASY
Choose the correct answer
A
10 mm
B
20 mm
C
30 mm
D
40 mm
Correct Answer
B. 20 mm
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IS 456 Clause 26.4: Nominal cover for slabs in mild exposure = 20 mm. This protects steel from corrosion and fire. Clear cover = nominal cover − half bar dia. For beams mild exposure = 25 mm, columns = 40 mm. Covers increase with exposure severity.
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