United States Department of Transportation
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Structural evaluation of LIC-310-0396 and FAY-35-17-6.82 box beams with advanced strand deterioration : executive summary report.
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2011-09-01
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[PDF-315.35 KB]
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Edition:Executive summary report.
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Abstract:Adjacent prestressed concrete box beam bridges are popular in Ohio with approximately 1,100 bridges existing that are under ODOT maintenance responsibility, amounting to approximately 9% of all Ohio’s bridges. However, these bridges are also very common at the local level and when all bridges in the state are considered, these bridges account for approximately 17% of all bridges in Ohio.
The typical box beam bridge in Ohio (and in many states) is a non-composite bridge consisting of side by side beams connected only by a grouted shear key and transverse tie bars. These bridges usually have an asphalt overlay. Over time, the grouted joints crack and the cracks reflect into the asphalt layer. Chlorides penetrate through cracked joints and can infuse into the side of the beam. Eventually, these chlorides accelerate corrosion of the prestressing strands. The sides of the beams are not visible due to their adjacent placement and the corrosion may not be observed during inspections. Although this problem is most prevalent with non-composite bridges, it can also occur in composite bridges when the shear key cracks reflect through the concrete deck. With such a significant portion of the bridges being prestressed concrete adjacent box beam bridges and being aware that deterioration of strands may not be visible during inspection, it is imperative to have well developed inspection, rating, and analysis procedures in place that can be supported by experimental data. Therefore, testing and evaluation of prestressed concrete boxes that have been in-service and are of varying degrees of visible deterioration were warranted.
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