Abstract
Developments in cathodic protection for aerial concrete structures are described. The principles on which the technique is based and the various protecting effects induced by the cathodic polarization of reinforcement are illustrated; the differences between the cathodic protection applied to control corrosion rate of chloride contaminated constructions and that applied to improve the corrosion resistance of the reinforcement of new structures expected to become contaminated are underlined; and the negative consequences of the method and the way to control them are shown. The operating conditions as far as potential and current are concerned and the problems regarding throwing power, the possibility to reach a condition of protection without running the risk of hydrogen embrittlement in the case of prestressed structures are discussed. Examples of cathodic protection and cathodic prevention design, execution, operation and monitoring are given.
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