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Research notes : zinc anodes to protect coastal bridges.
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2002-04-01
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Alternative Title:Zinc anodes to protect coastal bridges.
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Abstract:Oregon is blessed with a beautiful coastline. Unfortunately, transportation structures on the coast must withstand an aggressive marine environment that causes corrosion problems. Many reinforced concrete bridges, some having historical significance, have been damaged by corrosion to the point where they must be replaced. In the late 1980s, the Oregon Department of Transportation (ODOT) began testing two methods to protect bridges – impressed current cathodic protection (ICCP) and sacrificial anode cathodic protection (SACP).
ODOT used a thermal-sprayed zinc metal for most of its anodes. The zinc wire was continuously melted in an electric arc, and the molten metal was propelled onto the concrete at high velocity. Although these systems were proven to work, the life of the anode and the operating characteristics of the cathodic protection systems over the life of the anode were unknown.
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