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Corrosion performance of prestressing strands in contact with dissimilar grouts.
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    Final report.
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  • Abstract:
    To improve the corrosion protection provided to prestressing strands, anti-bleed grouts are used to fill voids in post-tensioning

    ducts that result from bleeding and shrinkage of older Portland Cement grouts. Environmental differences caused by exposing the

    strands to dissimilar grouts, however, have the potential to cause rapid corrosion. Portland Cement grout, gypsum grout, and four

    commercially available prepackaged grouts were analyzed to determine the chemical composition of the resulting pore solutions

    and tested to determine if using a second grout will provide improved corrosion protection for prestressing strands or result in

    accelerated corrosion. The potential consequences of leaving the voids unfilled were also evaluated. Pore solutions were analyzed

    for pH and sodium, potassium, fluoride, chloride, nitrite, sulfate, carbonate, nitrate, and phosphate ion content. The analyses were

    used to develop simulated pore solutions. Selected grouts and simulated pore solutions were paired to evaluate their potential to

    cause corrosion of, respectively, grout-wrapped and bare stress-relieved seven-wire prestressing strands using the rapid macrocell

    test. Strands were also evaluated in simulated pore solutions containing chlorides and in deionized water. Because exposure of

    strands to water or chlorides has the potential to cause rapid corrosion, filling voids in post-tensioning ducts with an anti-bleed

    grout is recommended. Gypsum grout, with its low pH and high sulfate content, will cause accelerated corrosion of strands when

    used in conjunction with Portland Cement grout or any of the commercially prepackaged grouts tested. When paired with Portland

    Cement grout, the prepackaged anti-bleed grouts evaluated in this study resulted in corrosion losses significantly below those

    observed for strands exposed to salt or water. The highest corrosion measured for a prepackaged grout occurred for the grout with

    the highest pore solution sulfate content.

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