Cape Creek Bridge: Difference between revisions

The Cape Creek Bridge has been impressed-current [[Cathodic protection|cathodically protected]] (ICCP) from [[corrosion]] since 1991. [[Rebar]] in concrete is highly susceptible to corrosion by [[chloride]] ions from [[seawater]] and [[De-ice|de-icing salts]]. Contractors to the [[Oregon Department of Transportation]] have [[Thermal spraying|plasma-sprayed]] 9500 m² of 0.5-mm thick [[zinc]] onto the exposed concrete to provide a [[Galvanic*** anode|sacrificial*** anode]] that corrodes*** in lieu of the steel rebar.**** —NOTE this is incorrect, the zinc is NOT intended as a sacrific<ref></ref>ial anode, but rather as a distributor of external electric current to counter the natural current that takes place under the corrosion process. <Ref> See US Patent 4,506,485 Mar 26, 1985. <ref>“Cape Creek Bridge Cathodic Protection Operating Data: 1992-94,” Oregon Dept. of Transportation Report, 1995.</ref><ref>R. Brousseau, M. Arnott & B. Baldock, “Laboratory Performance of Zinc Anodes for Impressed Current Cathodic Protection of Reinforced Concrete’” ''Corrosion'' '''51''', 8 (Aug 1995): p 639-644.</ref><ref>B.S. Covino, Jr., S.J. Bullard, G.R. Holcomb, S.D. Cramer, G.E. McGill, and C.B. Cryer, “Bond Strength of Electrochemically Aged Arc-Sprayed Zinc Coatings on Concrete,” ''Corrosion'' '''53''', 5 (May 1997): p 399-411.</ref><ref>G.R. Holcomb, B.S. Covino, Jr., J.H. Russell, S.J. Bullard, S.D. Cramer, W.K. Collins, J.E. Bennett and H.M. Laylor, “Humectant Use in the Cathodic Protection of Reinforced Concrete,” ''Corrosion'' '''56''', 11 (Nov 2000): p 1140-1157.</ref>