The PCA site lists about 5-7 days minimum curing time, and 28-days to reach
specification strength. Concrete actually continues to get stronger after 28
days.
Here are some good links for concrete, by the Portland Cement Association.
There's a lot of good information on the site.
FAQ:
http://www.cement.org/tech/cct_faqs.asp
Basics:
http://www.cement.org/basics/concretebasics_faqs.asp
-- Tom, N5EG
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