Corrosion characteristics of unprotected post-tensioning strands under stress : [summary].
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Corrosion characteristics of unprotected post-tensioning strands under stress : [summary].

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  • English

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    • 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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