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Corrosion characteristics of unprotected post-tensioning strands under stress : [summary].
  • Published Date:
    2014-05-01
  • Language:
    English
Filetype[PDF-1.06 MB]


Details:
  • Corporate Creators:
  • Publication/ Report Number:
    BDK84-977-22
  • Resource Type:
  • Geographical Coverage:
  • Format:
  • Abstract:
    Post tensioned concrete is used in many Florida

    transportation structures, many of which are

    exposed to fresh or salt water. The steel strands

    that supply the tension are encased in a plastic

    duct which is later filled with grout, so the strands

    are generally well protected from the elements.

    However, during construction, strands may

    reside in the pipe for a while before tensioning

    or grouting. During this time, the strands are

    vulnerable to corrosion. Florida Department of

    Transportation (FDOT) guidelines specify sealing

    the duct to exclude moisture or other harmful

    agents from reaching the steel strand. However,

    if moisture is sealed in the duct or the duct is

    inadequately sealed, corrosion can result. Ideally,

    ducts are grouted within hours of stressing, but

    there are circumstances that can delay grouting

    for days or, rarely, weeks. If damaged, strand

    failure can be immediate, or it can mature over

    time to produce delayed failure.

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