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The corrosion of reinforcing and prestressing steel in concrete structures caused by stray currents. The history of stray-current corrosion, sources, mechanisms, effects on structures, detection and mitigation.
This technical committee report reviews the corrosion of reinforcing and prestressing steel in concrete structures caused by stray currents. It provides information on the history of stray-current corrosion, the sources of stray currents, the mechanism of corrosion, the effects on structures, and detection and mitigation of stray-current-induced corrosion on steel in concrete. Also covered are measures taken during the design phase and modeling of the stray-current effects. The report is intended for use by designers of reinforced concrete structures, professionals dealing with electrochemical techniques (e.g., cathodic protection, realkalization, and electrochemical chloride removal), owners of structures with the potential for reinforcement corrosion caused by stray currents, owners of systems that could generate stray currents to concrete structures, and electrical engineers.
Key words: Stray current, AC, DC, corrosion, reinforcement, cathodic protection
HISTORICAL DOCUMENT. This NACE International standard practice establishes the general principles to be adopted to minimize the effects of stray current corrosion caused by direct current (DC) and/or alternating current (AC) from external sources on steel reinforced concrete (RC) and prestressed concrete (PC) structures or structural elements. The standard practice offers guidance for the design of concrete structures that may be subject to stray-current corrosion; the detection of stray current interference; the selection of protection measures; and the selection of mitigation methods.
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