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Crack width restriction of concrete is of prime importance during design of
1. Multi storeyed structures 
2. Earthquake resisting structures
3. Industrial structures 
4. Water retaining structures

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Correct Answer - Option 4 : Water retaining structures

Concept:

  • The concrete structures that retaining water inside or outside is considered as water retaining structures.
  • Water tightness is the most important parameter to be preserved in designing and construction sequences among all other requirements. The structure is considered as failure if the water passes from one side of the structure to the other side.
  • Water sump, water tanks, swimming pools and manholes are some of the examples for the water retaining structures in practice.
  • Crack width is the limiting criteria in the design of water retaining structures.
  • Generally, the concrete structures are designed to the maximum crack width of 0.3 mm.
  • But in case of the water retaining structures, the water tends to pass through the cracks developed on the surface which must be eliminated through the design. 
  • However, the concrete itself can filled the crack developed through the process called Self-healing up to 0.2 mm crack width. So that concrete will become watertight within few days while exposed to water.
  • Therefore, in case of the water retaining structures, the maximum crack width is limited to 0.2 mm to achieve the water tightness by self-healing or 0.1 mm if the appearance is the matter in the design procedure.

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