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Chloride induced corrosion of steel reinforcement in concrete structural elements is a major worldwide problem [1]. Chlorides can be introduced into the concrete via de-icing salts, seawater, high salinity groundwater or sabkha soils [1.2]. This leads to localised breakdown of the normally passive steel reinforcement in the form of pitting corrosion [2].
Galvanic corrosion protection systems have been developed to provide long-term corrosion protection to existing concrete structures suffering from corrosion. Through the partnership and support of structure owners such as Ohio Department of Transportation, Ontario Ministry of Transportation, Florida Department of Transportation and Transport New South Wales these systems have been installed and monitored on bridge decks and substructures for many years. Some of these structures have been monitored for over 20 years. This paper presents the development, installation and 20-year field performance of these galvanic corrosion protection systems and how this real-world performance data can be used to design long-life galvanic corrosion protection systems to extend the service life of reinforced concrete structures.
A case study of a major CP system operating in Australia for 15 years and proposal of a series of changes to current practices which can be considered for implementation in the design, installation and monitoring stages of new impressed current cathodic protection systems in concrete.
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The use of cathodic protection has become the preferred method for mitigating corrosion of steel reinforcement in concrete. A wide variety of both impressed current and sacrificial systems have been effectively used to control the effects of corrosion.
This paper is based on a case study of cathodic protection of building foundation piles for several buildings installed on top of a landfill in the San Francisco Bay Area.