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Abstract:Concrete sets in hours at moderate temperatures,
but the bonds that make concrete strong continue
to mature over days to years. However, for
replacement concrete slabs on highways, it is
crucial that concrete develop enough strength
within a few hours so that the lane under
repair can be reopened for traffic. The Florida
Department of Transportation (FDOT) specifies
that concrete in this application have compressive
strength of at least 2,200 pounds per square inch
(psi) before reopening and 3,000 psi at 24 hours.
The earlier that engineers know the concrete will
meet its maturity, the better. There is a tradeoff
between opening too early and damaging the
concrete or waiting and incurring additional costs.
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