| Topic : Concrete Design Structures |
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Construction Planning & Management |
Project Management Civil |
Construction Project Management THINKPOT...!!! |
2 more ...
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Activity:
Question posted: 11 26 2009 12:05:23 +0000,
1 answers, 129 views, last activity
07 06 2010 20:18:08 +0000
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Cracking of concrete is a frequent cause of complaints. Cracking can be the result of one or a combination of factors, such as drying shrinkage, thermal contraction, etc.. How to minimize concrete cracking?
It would be great if you answer this question.......
Cracking in concrete can be reduced significantly or eliminated by observing the following practices:
1. Minimize the mix water content by maximizing the size and amount of coarse aggregate and by using low-shrinkage aggregate.
2. Use the lowest amount of mix water required for workability and placement; do not permit overly wet consistencies.
3. Use calcium chloride admixtures only when necessary.
4. Prevent rapid loss of surface moisture while the concrete is still plastic through use of spray-applied finishing aids or plastic sheets to avoid plastic-shrinkage cracks (more important in slabs)
5. Provide contraction joints at reasonable intervals, 30 times the wall thickness is a good “rule-of-thumb”.
6. Prevent extreme changes in temperature after placement and initial cure.
7. Properly place and consolidate the concrete.
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I agree with you anant. It is the best method... |
I agree with Mr.mohammad and I think there is no such empirical formula so you can spend a reasonable amount on site investigation.... |
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