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Q: What is the permitted limit of deviation of the actual concrete cover from the required nominal cover, as per IS: 456:2000, unless specified otherwise?
  • A. +0 mm and –10 mm
  • B. +10 mm and –10 mm
  • C. +5 mm and –5 mm
  • D. +10 mm and 0 mm
Correct Answer: Option D - As per IS 456-2000, Clause 12.3.2, Tolerance for cover– Unless specified otherwise, actual concrete cover should not deviate from the required nominal cover 0 to 10 mm.
D. As per IS 456-2000, Clause 12.3.2, Tolerance for cover– Unless specified otherwise, actual concrete cover should not deviate from the required nominal cover 0 to 10 mm.

Explanations:

As per IS 456-2000, Clause 12.3.2, Tolerance for cover– Unless specified otherwise, actual concrete cover should not deviate from the required nominal cover 0 to 10 mm.