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Is the crack width induced by concrete hydration and flexure should be considered individually to satisfy the above maximum crack width requirements?

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For the purpose of defining the serviceability crack width limit state, the maximum design surface crack widths for the exposure conditions defined in BS8007 should be taken to be the following:

The maximum design surface crack widths for direct tension and flexure or restrained temperature and moisture effects are:
1) severe or very severe exposure: 0.2 mm;
2) critical aesthetic appearance: 0.1 mm.

Is the crack width induced by concrete hydration and flexure should be considered individually to satisfy the above maximum crack width requirements?

The crack width induced by concrete hydration and flexure should be considered individually to satisfy the above maximum crack width requirements. For crack width less than 0.2mm, it is assumed that the mechanism of autogenous healing will take place in which the crack will automatically seal up before the structure is brought into service. The crack width induced by hydration, which is checked to be less than 0.2mm, is sealed up first and then it will be subject to flexure for another checking on crack width.

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This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

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  • shibu swamidas May 12, 2013 at 8:24 am

    I have constructed a water tank size of 64M X 54m X 9m size with design of crack width 0.2mm without expansion joint. is any internal water proofing required , if required please suggest the material

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