Repair and Maintenance of Post-Tensioned Concrete Bridges (2021) / Chapter Skim
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Pages 27-39
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27 An online-based survey was distributed to the 50 state departments of transportation in February 2020. Initial survey distribution occurred that month, with subsequent attempts to contact agencies to gather as many responses as possible.
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28 Repair and Maintenance of Post-Tensioned Concrete Bridges Figure 7. Survey participation by state DOTs.
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Number of States 0 10 20 30 40 50 Have performed repairs Have PT structures 23 44 Figure 9. States with post-tensioned bridge structures and with repair experience.
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30 Repair and Maintenance of Post-Tensioned Concrete Bridges States have performed repairs on every type of PT structure (see Figure 10)
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Survey 31 (referred to by four states: Alaska, Arizona, Hawaii, and Nevada) , in the development of their PT specifications.
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32 Repair and Maintenance of Post-Tensioned Concrete Bridges PT structures, PL-3. Five states (Louisiana, Minnesota, Mississippi, New York, and Rhode Island)
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Survey 33 Consultant inspection (CEI) In-houseContractor N um be r o f S ta te s 0 5 10 15 20 25 30 Note: QA = quality assurance; QC = quality control.
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34 Repair and Maintenance of Post-Tensioned Concrete Bridges Additional questions were aimed at identifying trends among repair occurrences and potential causes (see Figure 16)
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Survey 35 an alternate repair approach (involving drying of tendons and injection with corrosion inhibitors; see Wonderwood Connector case example, Chapter 3)
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36 Repair and Maintenance of Post-Tensioned Concrete Bridges Number of States Figure 18. Problematic construction details.
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Survey 37 diabolo-shaped deviator type. The appeal of this detail is the gentle angle change at the entrance of the deviator void, which eases the transition of the duct profile at deviation locations.
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38 Repair and Maintenance of Post-Tensioned Concrete Bridges Four states identified having issues with the removal of deck-level vents and the placement of the permanent caps. In general, the details for these areas are nonspecific, with methodology left up to the contractor.
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Survey 39 Inspection and Maintenance Many states report performing nonroutine inspections of their PT structures (see Figure 17) , including invasive inspections (14)
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