Evaluating the constructability of NUDECK precast concrete deck panels for Kearney Bypass Project.
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Evaluating the constructability of NUDECK precast concrete deck panels for Kearney Bypass Project.

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  • Abstract:
    The first generation of precast concrete deck system, NUDECK, was implemented on the Skyline Bridge,

    Omaha, NE in 2004. The second generation of NUDECK system was developed to further simplify the

    system and improve its constructability and durability. The new generation consists of full-width full-depth

    precast concrete deck panels that are 12 ft long to minimize the number of deck panels and transverse joints,

    and consequently accelerate bridge construction. It also uses covered individual pockets and bundled shear

    connectors at 4 ft spacing to simplify panel and girder production and eliminate the need for deck overlay.

    Precast deck panels are pre-tensioned in transverse direction and post-tensioned in the longitudinal

    direction to enhance deck durability. Post-tensioning strands are placed underneath the deck panels (at the

    haunch area) to eliminate threading strands through ducts and grouting operations.

    The objective of this project is to investigate the constructability of the 2nd

    generation NUDECK system

    through full-scale testing of two key features: 1) using self-consolidating concrete (SCC) to fill the gap

    between precast concrete deck panels and bridge girders as well as covered deck pockets; and 2) using the

    proposed deviators and anchorage block in the end deck panels for post-tensioning the bridge deck. These

    investigations includes evaluating the pumpability/pouring of the developed SCC mixture in mockup and

    full-scale specimens. Sequence of pumping/pouring of SCC as well as its quality control and quality

    assurance procedures are also demonstrated. The investigations also include pullout testing of the deviators

    and pushoff testing of the anchorage block used for post-tensioning to evaluate their performance and refine

    their reinforcement details.

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