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Moist Cure Duration

Moist Cure Duration

Moist Cure Duration

(OP)
ACI tells us to moist cure 5 days at 70 degrees F or 7 days at 50 degrees F for standard 28 day concrete. What about high early concrete that fully matures in say 7 days or 10 days? What duration of moist curing should be used? Any guidelines? Can I proportion the required cure times or is there some formula that I can use?

RE: Moist Cure Duration

Generally high early strength concrete should be cured in the same manner as conventional concrete.  The reasoning behind the minimum curing time for concrete is to allow it to achieve a minimal level of strength before you allow the autogenous curing/hydration process to prevail.  Usually you look for 50 to 70 percent of f'c during the curing process.  For high early strength, you can usually achieve that in about 3 days.

RE: Moist Cure Duration

(OP)
Ron:

I am a little confused by your answer. The first sentence says to cure HE concrete the same as 28 day concrete but then the last sentence seems to say 3 days.

Which is it???

RE: Moist Cure Duration

jike...what I meant by that is it should be cured under the same strength gain criteria...so if you wait until the normal concrete gains 70 percent strength, say at 7 days, you would cure the HE concrete until it reaches 70 percent, which will typically come in 3 to 4 days.

RE: Moist Cure Duration

(OP)
Thanks Ron for the clarification!

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