This note deals with stray-current induced corrosion of reinforced and prestressed concrete structures. Stray currents (direct, DC, or alternating, AC) may arise, for instance, from railways, tramways, cathodic protection systems, grounding or high voltage power lines. Unlike for buried metallic structures, in the case of concrete structures such interference phenomena rarely have corrosion consequences, except in specific conditions which are discussed in this note in relation to concrete properties (alkaline, carbonated or contaminated by chlorides) and features of the current (density and type). Furthermore, the prevention of stray-current induced corrosion is described keeping in mind the most innovative aspects that concern the field of constructions (i.e., the use of special materials). Although this phenomenon seldom occurs it is necessary to take into account the difficulty to monitor and prevent it; this suggests that this corrosion phenomena can not be neglected for structures for which a longer service life is required compared to ordinary ones.

Correnti disperse e corrosione delle armature

CARSANA, MADDALENA
2013-01-01

Abstract

This note deals with stray-current induced corrosion of reinforced and prestressed concrete structures. Stray currents (direct, DC, or alternating, AC) may arise, for instance, from railways, tramways, cathodic protection systems, grounding or high voltage power lines. Unlike for buried metallic structures, in the case of concrete structures such interference phenomena rarely have corrosion consequences, except in specific conditions which are discussed in this note in relation to concrete properties (alkaline, carbonated or contaminated by chlorides) and features of the current (density and type). Furthermore, the prevention of stray-current induced corrosion is described keeping in mind the most innovative aspects that concern the field of constructions (i.e., the use of special materials). Although this phenomenon seldom occurs it is necessary to take into account the difficulty to monitor and prevent it; this suggests that this corrosion phenomena can not be neglected for structures for which a longer service life is required compared to ordinary ones.
Corrosion; reinforced concrete; stray-current; interference; alkalinity; chlorides.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/905358
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