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

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  • 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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