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Re: Sla-On-Grade Curing/Loading
Depends on the mix and the admixtures, if any.
In South Florida, if the right mix was used, they were allowed to stack block on the slab after just 12 hours. The easiest way to accomplish that, if you need 2500 psi concrete, would be to place 7000 psi mix concrete, that's probably 3500 psi in 12 hours.
That said, once, in Gainesville, Florida, they (local contractors all got together and coordinate this) constructed a stick built house in 11 hours, *INCLUDING* placing the steel and pouring the concrete - that concrete was curing almost faster than it could be placed, and you had almost zero time to screed it, float it, and trowel it before it was too stiff (hard) to do anything with ... had to, because the walls were being set on it before the concrete finishers were done. Remember, only 11 hours to completion of the home.
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