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GALVANIC CATHODIC PROTECTION OF
REINFORCED CONCRETE BRIDGE MEMBERS
USING SACPJnCIAL ANODES ATTACHED BY
CONDUCTIVE ADHESIVES
| 题名： | GALVANIC CATHODIC PROTECTION OF REINFORCED CONCRETE BRIDGE MEMBERS USING SACPJnCIAL ANODES ATTACHED BY CONDUCTIVE ADHESIVES |
| 作者： | J.E. Bennett and T.J. Schue |
| 关键词： | Corrosion, CaAoAc Protection, Anodes, Bridges, Concrete, Sacrificial Anodes, Hydrogel, Galvanic Cathodic Protection |
| 摘要： | This is the final report in a study to investigate the feasibility of using galvanic cathodic protection (CP) of reinforced concrete bridge members using sacrificial anodes attached by conductive adhesives. Galvanic CP systems have recognized advantages of simplicity and the potential to operate with little or no maintenance for the life of the system. But applications have so far been limited to the seawater splash and tidal zone where concrete is moist and conductive, and where the anode surface is periodically wetted. In this study, a new galvanic CP system was investigated in which sacrificial anodes were attached to Ac concrete surface with ionically conductive adhesives called hydrogels. Laboratory studies first demonstrated that aluminum and aluminum alloys were unsuitable as anodes in contact with hydrogel adhesives. Zinc attached by hydrogel adhesive was selected as the sacrificial anode for installation on field validation trials. Studies also resulted in the development of a hydrogel adhesivewith adequate performance and life expectancy. Three field trials were installed and monitored under this contract. About 1000 ft2(93m2) of zinc/hydrogel was installed on the pilings, pile caps, and double-tee beams of a fishing pier in Ft. Pierce, Florida. Although electrical contact was disrupted on one of the beams, most of the system performed well and met the 100 mV potential decay criterion after 32 months of operation. Zinc/hydrogel anodes installed on the bearing pads of V-piers of the Long Key Bridge also performed well, generally meeting accepted CP criteria. A more recent installation of 700 ft2 (65m2) on the Cape Perpetua half-viaduct m Oregon has performed well for 1 year, providing about 0.3 mA/ft2 (3.2 mA/m^) and easily achieving CP criteria. The zinc/hydrogel anode was easy to install, fix and L.3 performed generally well for all three trials conducted under this contract. |
| 报告类型： | 科技报告 |
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