Bridges for Service Life Beyond 100 Years: Innovative Systems, Subsystems, and Components (2014) / Chapter Skim
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5C h a p t e r 2 This chapter outlines the efforts, steps, and approaches used to fulfill the project objectives. To accomplish the final goals of Project R19A, tasks were divided into Phase 1 and Phase 2.
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6Bridge System Service Life and Durability The first series of questions dealt with what common steel or concrete bridge system (such as steel girder, steel truss, prestressed concrete girder) is the most problematic regarding service life and typically requires the highest level of maintenance.
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7• Systems that have performed the best -- Most respondents listed prestressed concrete girder systems, particularly prestressed I-girders and nonskewed prestressed girders. Others mentioned continuous systems without joints and weathering steel girder systems.
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8steel protection, improved deck preservation systems, improved joint details, and effective concrete curing. • Subsystems that have performed the best -- For decks, the res pondents identified the best performers as cast-inplace decks with adequate reinforcing bar cover, cast-inplace decks with burlap curing and strict enforcement of temperature gradient during pouring, high-quality concrete and quality control methods, and properly constructed latex-modified concrete– or microsilica-modified concrete– overlaid decks.
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9the project, various presentations were made during every AASHTO bridge subcommittee meeting. Input from experts Outside the r19a research team Several individuals with expertise related to the R19A research theme were identified, and meetings and phone conferences were held to acquire their input.
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10 Guide: Project Main Product Information summarized in the Guide was obtained through many activities and resources, including • Results of research studies conducted on Category 1 and 2 research topics; • Available information from the AASHTO LRFD Bridge Design Specifications (AASHTO 2004, 2010b) and AASHTO LRFD Bridge Construction Specifications (AASHTO 2010a)
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