Simulation of prepackaged grout bleed under field conditions : [summary].
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Simulation of prepackaged grout bleed under field conditions : [summary].

Filetype[PDF-835.52 KB]


  • English
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    Details:

    • Creators:
      Hamilton, H.R.
    • Corporate Creators:
      University of Florida
    • Subject/TRT Terms:
    • Publication/ Report Number:
      BDK75-977-59
    • Resource Type:
      Brief
    • Geographical Coverage:
      Florida
    • Corporate Publisher:
      Florida. Dept. of Transportation
    • Abstract:
      Post-tensioning (PT) is a method of compensating

      for concrete’s weakness under tension by adding

      steel. Tubes (ducts) are cast into concrete

      components; after the concrete sets, high-strength steel cables (tendons or strand) are run

      through the ducts, secured at both ends, and

      tensioned by powerful jacks. The ducts are then

      filled with PT grout, which hardens, preventing

      corrosion and bonding the cables to the concrete.

      PT is a very successful and widely used method.

      However, its durability depends on the quality of

      the grout and its installation. Since grouting is a

      blind operation, some problems with grout only

      become apparent years later — as soon as two

      years in some cases. Voids or other irregularities in

      grout distribution or setting can lead to corrosion,

      which can lead to failure of the concrete

      component. In this report, University of Florida

      researchers focused on a problem which has been

      found in several bridges in Florida, soft grout —

      grout which has not hardened after many years

      and is often associated with corrosion.

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