Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Underwater fiber-reinforced polymers repair of prestressed piles in the Allen Creek Bridge
The combination of high humidity and high temperature is lethal for high quality concrete, as it allows chloride ions to penetrate to the level of the reinforcement. This paper describes a field demonstration study to evaluate the application of FRP (fiber reinforced polymer) for the underwater repair of corroding prestressed piles. A total of four full-sized 35 x 35 cm square prestressed piles were wrapped, two with carbon and two with glass. Two of these wrapped piles - one carbon and one glass - were instrumented to allow evaluation of their postwrap performance. The study showed that underwater wrapping is a viable system. As with most FRP retrofits, surface preparation is of paramount importance. In this case, surface preparation required equipment capable of operating underwater to grind sharp corners. Although initial field tests on the witness panels indicated that the bond between the wet concrete and the FRP was relatively poor, laboratory tests showed the bond was sufficient to restore the full undamaged capacity. Corrosion rate measurement indicate that the performance of the wrapped piles is consistently better than the unwrapped controls.
Underwater fiber-reinforced polymers repair of prestressed piles in the Allen Creek Bridge
The combination of high humidity and high temperature is lethal for high quality concrete, as it allows chloride ions to penetrate to the level of the reinforcement. This paper describes a field demonstration study to evaluate the application of FRP (fiber reinforced polymer) for the underwater repair of corroding prestressed piles. A total of four full-sized 35 x 35 cm square prestressed piles were wrapped, two with carbon and two with glass. Two of these wrapped piles - one carbon and one glass - were instrumented to allow evaluation of their postwrap performance. The study showed that underwater wrapping is a viable system. As with most FRP retrofits, surface preparation is of paramount importance. In this case, surface preparation required equipment capable of operating underwater to grind sharp corners. Although initial field tests on the witness panels indicated that the bond between the wet concrete and the FRP was relatively poor, laboratory tests showed the bond was sufficient to restore the full undamaged capacity. Corrosion rate measurement indicate that the performance of the wrapped piles is consistently better than the unwrapped controls.
Underwater fiber-reinforced polymers repair of prestressed piles in the Allen Creek Bridge
Unterwasserreparatur von vorgespannten Pfeilern der Allen Creek-Brücke mit faserverstärkten Kunststoffen
Mullins, Gray (Autor:in) / Sen, Rajan (Autor:in) / Suh, Kwangsuk (Autor:in) / Winters, Danny (Autor:in)
Journal of Composites for Construction ; 9 ; 136-146
2005
11 Seiten, 19 Bilder, 1 Tabelle, 14 Quellen
Aufsatz (Zeitschrift)
Englisch
Underwater Fiber-Reinforced Polymers Repair of Prestressed Piles in the Allen Creek Bridge
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