Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Corrosion protection of steel-reinforced concrete wrapped in fiber-reinforced plastic
In this six-year study concrete prisms and cylinders with conventional steel reinforcement were wrapped in a 6 mm layer of fiberglass-reinforced plastic laminate intended to inhibit corrosion of the reinforcing steel. The FRP wrap typically covered approximately the top two-thirds of each specimen's length. The bottoms of the specimens were then exposed to cycles of wetting and drying. Each cycle consisted of two weeks exposure to a 3.5 % NaCl brine solution followed by two weeks of drying. This exposure method was intended to simulate the corrosive wetting and drying cycles of marine splash zones and thus accelerate the corrosion process of the embedded steel reinforcement. Other variables affecting corrosion activity were also included in the study. Specimens were monitored quarterly both visually and electrically via voltmeter readings of half-cell potentials. At the end of the research project each specimen was removed and photographed both at the FRP surface and at the concrete surface beneath it to record visual irregularities and indications of corrosion. Each specimen was also evaluated for any localized variations in half-cell potentials and chloride ion penetration. The experiment investigated possible reduction of corrosion activity due to the FRP wrap used with other corrosion-mitigating methods.
Corrosion protection of steel-reinforced concrete wrapped in fiber-reinforced plastic
In this six-year study concrete prisms and cylinders with conventional steel reinforcement were wrapped in a 6 mm layer of fiberglass-reinforced plastic laminate intended to inhibit corrosion of the reinforcing steel. The FRP wrap typically covered approximately the top two-thirds of each specimen's length. The bottoms of the specimens were then exposed to cycles of wetting and drying. Each cycle consisted of two weeks exposure to a 3.5 % NaCl brine solution followed by two weeks of drying. This exposure method was intended to simulate the corrosive wetting and drying cycles of marine splash zones and thus accelerate the corrosion process of the embedded steel reinforcement. Other variables affecting corrosion activity were also included in the study. Specimens were monitored quarterly both visually and electrically via voltmeter readings of half-cell potentials. At the end of the research project each specimen was removed and photographed both at the FRP surface and at the concrete surface beneath it to record visual irregularities and indications of corrosion. Each specimen was also evaluated for any localized variations in half-cell potentials and chloride ion penetration. The experiment investigated possible reduction of corrosion activity due to the FRP wrap used with other corrosion-mitigating methods.
Corrosion protection of steel-reinforced concrete wrapped in fiber-reinforced plastic
Whitney, D.P. (Autor:in) / Jirsa, J.O. (Autor:in) / Wheat, H.G. (Autor:in) / Fowler, D.W. (Autor:in)
2004
9 Seiten, 9 Bilder, 3 Quellen
Aufsatz (Konferenz)
Englisch
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