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Curing of "HOLD" cylinders

Curing of "HOLD" cylinders

Curing of "HOLD" cylinders

We have a job that is generating a LOT of cylinders--a set of 9 for every pour--. The manager of this office wants to keep the hold cylinders even after the 28 day tests were acceptable. OK--he is being cautious, and that is good.
The question is .....after 28 days of moist-curing, can cylinders be removed from the moist-cure environment? It would sure help if we could just stack them on the floor, outside of the moist-cure environment.
I suspect that such is not allowed as C31 requires the cylinders to be moist-cured until no more than 3 hours before being tested.
Does anyone know for sure?

RE: Curing of "HOLD" cylinders

Why so many cylinders, is your office manager an engineer? Cautious is one thing, but casting all those extra cylinders just to be safe is a waste of the client's money. I am not familiar with C31, but if its your governing code then the cylinders should be removed from moist curing per that specification.

RE: Curing of "HOLD" cylinders

No, they should stay in the moist environment. Whether it's 28 days, or 56 or 90 or 365, they all need to be treated the same.

RE: Curing of "HOLD" cylinders

Yep, TheSoilsGuy, that is how I read the Standard......I was "wishing" for a different answer.
But now, the peak has passes and the storage is no longer a [problem.

RE: Curing of "HOLD" cylinders

A little late to the game, but if they have already made strength i don't see any reason you couldn't store them dry. If you were have to break one of them, the ASTM requires you to note that they were removed from moist curing after 28-days... but that doesn't mean it is useless information. A big assumption in this is that the decision to retain holds is purely voluntary on your labs part because if it were specified in the project manual, specified verbally by the egr in a meeting, or specified on the plans.... you should moist-cure.

RE: Curing of "HOLD" cylinders

Cure the hold cylinders the same as the record cylinders.

RE: Curing of "HOLD" cylinders

Thanks--we are moist-curing until disposal or testing.
I think it is bad policy to hold on the cylinders after they have made the required strength. The only information can could provide would be bad....

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