In moderate conditions, the nominal concrete cover to meet durability requirements should not be less than-

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UKPSC JE Civil 8 May 2022 Official Paper-I
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  1. 20 mm
  2. 30 mm
  3. 45 mm
  4. 50 mm

Answer (Detailed Solution Below)

Option 2 : 30 mm
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Detailed Solution

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Explanation:

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. 

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