The Minimum Cover for an RCC column should be:
By BYJU'S Exam Prep
Updated on: September 25th, 2023
- Greater of 40 mm or diameter
- Greater of 30 mm or diameter
- Greater of 50 mm or diameter
- Greater of 25 mm or diameter
The minimum cover for an RCC column should be greater of 40 mm or diameter. The fire resistance and exposure circumstances determine the minimal clear cover.
- The design depth of concrete cover to all-steel reinforcements is known as the nominal cover to meet fire resistance.
- It must be at least as big as the bar’s diameter.
- The table below provides the minimum values of the nominal cover of normal-weight aggregate concrete that must be provided to all reinforcing to achieve the required period of fire resistance.
Minimum Cover for an RCC Column
Member |
Minimum Cover |
Slab |
20mm |
Beam |
20mm |
Column |
40mm for d>12mm 25mm for d<12mm |
Footing |
50mm |
Nominal Cover to Meet the Requirements for Durability:
Exposure |
Nominal Concrete cover (in mm) not less than |
Mild |
20 |
Moderate |
30 |
Severe |
45 |
Very severe |
50 |
Extreme |
75 |
Summary:-
The minimum cover for an RCC column should be: 1. Greater of 40 mm or diameter 2. Greater of 30 mm or diameter 3. Greater of 50 mm or diameter 4. Greater of 25 mm or diameter
For an RCC column, the minimum cover should be greater of 40 mm or diameter. The minimum clear cover is determined by exposure circumstances and resistance.
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