Cathodic Protection for Life Extension of Existing Reinforced Concrete Bridge Elements (2009) / Chapter Skim
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Chapter One - Introduction
Chapter One - Introduction
Pages 3-5
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From page 3... ...
Under certain circumstances, repair may accelerate the corrosion process and may result in its premature failure. In a Rehabilitation effort, in addition to repair of the damaged concrete, one or more of the following may be included to control corrosion: • Remove and replace all chloride-contaminated concrete; • Reduce the concentration of and change the distribution of chloride ions by using electrochemical chloride extraction; • Stop or slow the ingress of future chloride ions by using a less permeable cementitious overlay comprised of latex, silica fume, or fly ash-modified concretes; • Stop or slow the ingress of future chloride ions by using sealers, membranes, and waterproofing materials; • Repair cracks to prevent chloride ion contamination; • Apply barrier coatings on the reinforcing steel in the repair areas; • Apply corrosion inhibitors in the repair or over the entire concrete element to either interfere with the corrosion process or modify the characteristics of the in-place concrete; and • Apply a cathodic protection system.
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From page 4... ...
Although no formal studies have been performed, in interviews several states using cathodic protection systems indicated that it has stopped corrosion and reduced bridge maintenance costs, especially in very corrosive environments. The TRB Corrosion Committee has estimated that 30,000 more bridges are at risk and could be candidates for installation of galvanic cathodic protection systems.
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From page 5... ...
Only five responses were received from private industry. A literature survey was also performed to obtain information on practices and experience with the use of this technology.
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