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As per IS 456, using limit state design method, in members where cracking in tensile zone is harmful because they are continuously exposed to ground water, the limiting crackwidth suggested is

As per IS 456, using limit state design method, in members where cracking in tensile zone is harmful because they are continuously exposed to ground water, the limiting crackwidth suggested is Correct Answer 0.2 mm

Explanation:

Limits on crack width:

  • CI 35.3.2 of IS 456:2000 limits the width of cracks to a maximum limit of 0.3 mm for mild exposure conditions. This limit is based purely on aesthetic considerations. Fortunately, this limit on crack width is also found to be adequate for durability purposes also.
  • A lower limit of crack width of 0.2 mm is prescribed for structures exposed to continuous moisture conditions or which are in direct contact with soil or the ground water (moderate exposure condition). This limit on crack width is further reduced to 0.1 mm for severe, very severe, and extreme exposure conditions.

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