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Concrete curing of Foundations

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PEFLWI

Structural
Oct 23, 2012
120
US
How long should concrete spread foundations cure before they are backfilled?
 
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Depends on a lot.....temperature, humidity, curing process, construction sequencing, steel erection, etc.

I would say a minimum of 3 days with good cylinder breaks, but otherwise 7 days or until 75% of f'c is obtained.

 
Assuming 30mpa concrete and normal compaction equipment, 3 days should give you about 15mpa strength. Plenty of capacity. Ask for 3 day cylinder results before compaction.
 
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