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Precast concrete deck panel performance on long span, high traffic volume bridges : final report.
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    Final report.
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  • Abstract:
    The NHDOT prohibited the use of partial depth precast deck panels on its long span, high traffic volume bridges until it could investigate if the precast

    slabs and the concrete overpour were acting in a composite manner. The NHDOT also wanted to ensure that there was adequate transfer of traffic loads

    between the panels without causing reflective cracking. The purpose of this project was to investigate these two issues.

    The NHDOT reconstructed the deck of the I-393 bridge over the Merrimack River in Concord using precast concrete slabs and a concrete overpour in

    2002-2003. Cores were taken from this bridge deck to evaluate the composite behavior of the slabs and overpour and cracking was evaluated. Cores

    were taken before the introduction of traffic and then after the deck had been exposed to traffic for several months. Cracking was evaluated before and

    after traffic.

    The cores taken were subjected to tensile and shear strength testing across the panel/overpour interface and were found to perform satisfactorily. The

    tests provided conclusive evidence that there was excellent bond between the deck slabs and the overpour and that the strength of the bond was actually

    improving slightly over time. An inspection of the deck before and after traffic loading revealed that the panels were adequately transferring traffic loading

    without causing reflective cracking. Based on these results the NHDOT will permit the use of this type of deck construction on long span, high traffic

    volume bridges.

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