Question
Download Solution PDFIn moderate conditions, the nominal concrete cover to meet durability requirements should not be less than-
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
The minimum clear cover depends upon the exposure condition and fire resistance.
Nominal Cover to Meet Durability Requirements:
Exposure |
Nominal concrete cover (in mm) not less than |
Mild |
20 |
Moderate |
30 |
Severe |
45 |
Very Severe |
50 |
Extreme |
75 |
Nominal Cover to Meet Fire Resistance:
The nominal cover is the design depth of concrete cover to all steel reinforcements.
It shall be not less than the diameter of the bar.
Minimum values of the nominal cover of normal-weight aggregate concrete to be provided to all reinforcement to meet the specified period of fire resistance shall be given in the table below
Member |
Minimum Cover |
Slab |
20 mm |
Beam |
20 mm |
Column |
40 mm for d > 12 mm 25 mm for d < 12 mm |
Footing |
50 mm |
Note:
For main reinforcement, up to 12 mm diameter bar for mild exposure the nominal cover may be reduced by 5 mm.
Last updated on Mar 26, 2025
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