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timchi29 11-07-2008 08:55 AM

Concrete cure
Does anyone generally know how long concrete takes to cure? I got concrete installed in the crawl space 4 days ago and the humidity down there is still at 87%. I have the 4 vents open with 3 fans circulating the air. I know teh humidity will go down eventually, but how long should I keep the fans going for.


Maintenance 6 11-07-2008 01:01 PM

Are you sure your meter is accurate? Concrete will reach it's full rated strength in 28 days, but most of the moisture should be out of it within the first few days. At any rate, measure the moisture at the ceiling level. Anything over 65% with temps of 40-100 degrees is prime mold growing environment.

joed 11-07-2008 01:51 PM

Concrete cure and concrete dry are different things. Concrete cures best when wet. The first 7 days are most critical and then after 28 days it fully cured.
Put a dehumidifier on.

timchi29 11-07-2008 02:38 PM

I put it outside and it matched what the weather folks are saying so I put is back inside, at the ceiling at is says 84% at 66 degrees.

timchi29 11-07-2008 02:45 PM

I might want to add that it i3 75% humidity outside and damp and I have the vents open to circulate air. Does that make more sense?

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