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Q: As per IS 456:2000, in the case of columns of minimum dimension of 200 mm or under, whose reinforcing bars do NOT exceed 12 mm, the nominal cover used is _____.
  • A. 20 mm
  • B. 50 mm
  • C. 25 mm
  • D. 40 mm
Correct Answer: Option C - According to IS 456:2000, longitudinal reinforcing bar in a column nominal cover shall in any case not be less 40mm or less than the diameter of such bars. • In case of columns of minimum dimension of 200 mm or under; whose reinforcing bars not exceed 12 mm, nominal cover of 25mm may be used. • For footing minimum cover shall be 50 mm.
C. According to IS 456:2000, longitudinal reinforcing bar in a column nominal cover shall in any case not be less 40mm or less than the diameter of such bars. • In case of columns of minimum dimension of 200 mm or under; whose reinforcing bars not exceed 12 mm, nominal cover of 25mm may be used. • For footing minimum cover shall be 50 mm.

Explanations:

According to IS 456:2000, longitudinal reinforcing bar in a column nominal cover shall in any case not be less 40mm or less than the diameter of such bars. • In case of columns of minimum dimension of 200 mm or under; whose reinforcing bars not exceed 12 mm, nominal cover of 25mm may be used. • For footing minimum cover shall be 50 mm.