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Corrosion performance of prestressing strands in contact with dissimilar grouts : technical summary.
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2013-01-01
[PDF-443.52 KB]
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Abstract:Inspections of post-tensioned bridges
by the Kansas Department of Transportation
have revealed voids in strand ducts due to
bleeding and shrinkage of older Portland
Cement grouts. The Kansas Department
of Transportation is faced with a decision
whether to fill these voids or to leave them ungrouted. As long as the voids remain dry, the
strands typically appear intact with some surface rust. However, field observations indicate that
severe corrosion occurs in cases in which water or water containing chlorides comes in contact
with the strands. The usual approach to filling voids in post-tensioning ducts involves using
prepackaged anti-bleed grouts. Unfortunately, in a number of cases, the repair operations appear
to have led to rapid corrosion of the re-grouted strands. A likely cause of the rapid corrosion is
a difference in electrical potential in the strands caused by differences in environment provided
by the dissimilar grout.
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