Improved Inspection Techniques for Steel Prestressing/Post-tensioning Strand : Volume I
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Improved Inspection Techniques for Steel Prestressing/Post-tensioning Strand : Volume I

Filetype[PDF-4.00 MB]


English
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Details:

  • Alternative Title:
    Improved Inspection Techniques for Steel Prestressing/Post Tensioning Strand : Volume I
  • Creators:
  • Corporate Creators:
    Florida International University
  • Corporate Contributors:
    Florida. Department of Transportation
  • Subject/TRT Terms:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Florida
  • Edition:
    Draft final; Mar. 2011-Jun. 2012.
  • Corporate Publisher:
    Florida International University
  • Abstract:
    Post-tensioned bridges require a detailed inspection of their post-tensioning systems since damage in these

    systems is not evident and can result in costly repairs/replacements, loss of integrity and reduction in safety

    of the bridge. Different nondestructive evaluation (NDE) techniques can be used for the inspection of post-

    tensioning systems however; there is no systematic way by which a particular NDE technology may be

    selected for a particular job.

    This project presents elements and foundation for development of a systematic, job specific approach for the

    selection of NDE technology for inspection of the post-tensioning systems.

    In order to achieve this goal, factors affecting the performance of NDE techniques used for the condition

    assessment of the post-tensioning systems are identified. NDE techniques are then grouped according to

    their underlying phenomenological bases to put forth the working principles, and pros and cons that can be

    used for the development of ranking system.

    It has been found that major difference in grouting practice before and after 2000 affects the selection of

    NDE technique for the inspection of post-tensioning systems. Other factors affecting the performance of the

    NDE techniques are the duct system, geometrically difficult zones, and the types of defects. Separate sets of

    NDE technique are recommended for the internal/external ducts positioned along the traffic and

    geometrically difficult zones. A job specific “Ranking Index” is proposed for the selection of NDE that

    takes into account the not only the above mentioned factors but also the cost of conducting NDE. Based on

    the project findings a roadmap to develop comprehensive methodology to effectively assess the condition of

    post-tensioned bridge systems is presented.

  • Format:
    PDF
  • Funding:
    BDK80 977-13
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