Staged Concrete Bridge Deck Pours Adjacent to Live Traffic
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2018-11-01
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Abstract:An evaluation of the behavior of longitudinal joints in staged-constructed bridge decks subjected to traffic-induced displacements during curing of concrete was conducted through field inspections and monitoring, numerical analyses, and laboratory tests. Field inspection of deck-on-girder bridges showed no indication of adverse effects from traffic loading during staged construction. Concrete underconsolidation related to construction practices, however, was observed in several bridges. Haunched slab bridges constructed in stages, on the other hand, were found to be significantly more susceptible to deterioration along the longitudinal joint over time. The construction of haunched slab bridges in stages is thus not recommended. Results from field monitoring and numerical analyses of two bridges showed that differential deflections in short-to-medium-span prestressed concrete girder bridges are extremely small and are highly unlikely to adversely affect the integrity of the deck. Results from laboratory tests of two longitudinal joint specimens subjected to traffic-inducted displacements during concrete curing indicated that differential deflections up to 0.125 in. downward or 0.175 in. total movement did not appreciably impact the integrity of the concrete-bar bond in spliced reinforcement. A lap-splice length of 48 bar diameters was found to be adequate to develop the yield strength of the reinforcement after being subjected to traffic-induced displacements during concrete curing.
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