ASCE will be sunsetting the Civil Engineering Database (CEDB) in the coming months. We encourage you to start using the ASCE Library to perform content searches. In the ASCE Library, you can save your search results as well as receive email content alerts when new content relevant to your area of interest is published. Try it out today at https://ascelibrary.org.

 

Sprayed-Zinc Galvanic Anodes for the Cathodic Protection of Reinforcing Steel in Concrete

by Rodney G. Powers, Materials Office Florida Dep of, Transportation, Gainesville, United States,
Alberto A. Sagues, Materials Office Florida Dep of, Transportation, Gainesville, United States,
Toshiya Murase, Materials Office Florida Dep of, Transportation, Gainesville, United States,



Document Type: Proceeding Paper

Part of: Materials: Performance and Prevention of Deficiencies and Failures

Abstract:

Corrosion of reinforcing steel bars (rebars), due to penetration of chloride ions from seawater affects the substructure of many bridges in marine service. In a new, low cost control method, sacrificial anodes of arc-sprayed zinc are being applied to the surface of substructure members of Florida bridges. The zinc and underlying rebar are in electronic contact, and the intervening concrete acts as a conducting electrolyte. Field tests of this concept have been in progress for over two years. Laboratory investigations are being conducted to test the limits of applicability (necessary concrete conductivity, polarization characteristics, durability). The results to date are encouraging, showing that the systems retain physical integrity in harsh marine environments. Considerable protective current delivery can be achieved within the limitations of potential available from the galvanic couple and the concrete resistance. This paper describes the field installations with procedures used for the anode application, and highlights the results from the laboratory experiments.

Subject Headings: Bars (structure) | Reinforced concrete | Steel bridges | Reinforcing steel | Zinc | Substructures | Cathodic protection | Florida | United States

Services: Buy this book/Buy this article

 

Return to search