What is the minimum clear cover for column for mild exposure?

What is the minimum clear cover for column for mild exposure? Correct Answer 40 mm

Explanation:

Minimum clear cover requirement:

1. Slab = 20 mm

2. Beam = 25 mm

3. Column = 40 mm

4. Footings = 50 mm
Additional Information

For Column:

• For a longitudinal reinforcing bar in a column, concrete cover not less than 40 mm not less than the diameter of such a bar should be provided.
• In the case of columns of the minimum dimension of 20 cm or under, whose reinforcing bars do not exceed 12 mm, the concrete cover of 25 mm to be used for reinforcement.

For Slab:

• For Mild exposure - 20 mm, and For Moderate exposure - 30 mm
• However, if the diameter of the bar does not exceed 12 mm, or cover may be reduced by 5 mm. Thus for main reinforcement up to 12 mm diameter bar and for mild exposure, the nominal cover is 15 mm.