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Slab replacement maturity guidelines : [summary].
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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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