United States Department of Transportation
i
Spalling solution of precast-prestressed bridge deck panels.
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2010-10-01
[PDF-35.73 MB]
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Edition:Final.
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Abstract:This research has examined spalling of several partial-depth precast prestressed concrete (PPC) bridge decks. It was recently obser
that some bridges with this panel system in the MoDOT inventory have experienced rusting of embedded steel reinforcement a
concrete spalling issues in the deck panels. The objectives of this research were to investigate the causes of spalling in precastprestressed
panels and propose cost-effective alternative solutions including improved design options for new construction, as well
suggest mitigation methods for existing deteriorated bridge decks. A survey of transportation agencies and a series of bridge deck
investigations were conducted to determine the nature and causes of spalling. Panel deck system modifications were proposed
evaluated for potential use in new construction. These modifications were investigated in terms of structural performance and
serviceability with respect to the current design. Panel deck system modifications evaluated included an increase in tendon side cove
the addition of fibers or corrosion inhibitor to the panel concrete mixture, an increase in reinforcement in the cast-in-place concrete
topping, and the substitution of edge tendons with epoxy-coated steel or carbon fiber reinforced polymer tendons. Efficiency of th
proposed solutions was examined and validated through fundamental laboratory studies and numerical simulations using finite element modeling. Finally, recommendations are provided for new and existing construction to mitigate the spalling problem.
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