Cathode protection of atmosferic concrete structures in marine environment

Abstract:

Cathodic protection aims to control the corrosion of metals or preventing its premature occurrence. In metallic or concrete structures, cathodic protection is considered the only technique that can guarantee and /or extend its service life. Although the technique is suitable for concrete structures exposed to variable environmental conditions, it has been applied particularly to structures atmospheric when the reinforcement (carbon steel) are subject to corrosion attack by chloride ions or in a corrosion process. Since the beginning of its application, in the seventies (last century), the cathodic protection was been known as the solution for deteriorated concrete structures, where traditional methods of repair were inefficient or costly. According to ACI 222.3R, cathodic protection is widely used in concrete structures, being an effective method to reduce or eliminate corrosion. Classically, the cathodic protection of steel leads to the potential dominance of their immunity. In concrete structures, this concept can be applied only to those in submerged condition. In atmospheric structure, the concept is differentiated, been it discussed in this article, as well as the use of galvanic and impressed current protection system.


Reference:
ARAUJO, A.; PANOSSIAN, Z. Proteção catódica de estruturas de concreto em ambiente marinho. Téchne, v. 18, n. 164, p. 70-73, nov. 2010.

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