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The nominal cover requirements for meeting the durability requirements of mild, very severe, severe, moderate, extreme types of exposure are respectively in mm
1. 20, 30, 45, 50, 75
2. 20, 45, 30, 50, 75
3. 20, 50, 45, 30, 75
4. 20, 75, 50, 30, 45
5. 20, 50, 60, 75, 90

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Correct Answer - Option 3 : 20, 50, 45, 30, 75

Explanation:

Cover requirements as per IS 456:2000:

  • In order to prevent the reinforcement from corrosion, a layer of concrete should be there in reinforced concrete structures.
  • In actual construction practices, the specified minimum cover is very difficult to maintain. Thus IS 456:2000 specifies tolerance levels ranging from 0 mm to +10 mm i.e. no reduction in clear cover is permitted but the nominal cover can be increased up to 10 mm.
Exposure Conditions Minimum concrete grade Nominal cover 
Mild M20 20 mm
Moderate M25 30 mm
Severe M30 45 mm
Very severe M35 50 mm
Extreme M40 75 mm

  • Nominal cover can be decreased by 5 mm for main reinforcing bars of less than 12 mm diameter.
  • Nominal cover can be decreased by 5 mm if the concrete grade is M35 or higher.

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