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7 days

Posted by tomk on April 13th, 2003 06:21 AM
In reply to how long to dry? by Tim on April 11th, 2003 11:29 PM [Go to top of thread]

Forms can be removed from most concrete pours 24 hours after the pour, for the concrete can maintain it's shape by then. But it's still soft. Concrete takes 28 days to reach it's ultimate strength, but by the 7th day after the pour, it will have reached 90-95% of that ultimate strength. At that time, it will be hard and durable enough to be used for whatever purpose it was intended.

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