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Numerical modeling of initiation and propagation of corrosion in hollow submerged marine concrete structures
When reinforced concrete structures exposed to marine environments have both water-saturated and aerated parts, for instance, submerged tunnels or parking areas, a macrocell can develop. The electrochemical potential and the corrosion rate of reinforcing steel in the saturated part may increase because of this phenomenon. The goal of this paper was to study the effects of macrocells during corrosion initiation and propagation through numerical simulations of a wall separating a dry environment from seawater. When steel bars are passive, the potential of rebars in saturated concrete is increased by the macrocell and steel depassivation is promoted. After corrosion initiation, steel corrosion rate is increased by several orders of magnitude and the macrocell promotes also the localization of corrosion. A sensitivity analysis was carried out to investigate the influence of the main parameters: the models showed that some electrochemical parameters, such as the cathodic Tafel slope of the steel polarization curve, have a strong influence on the results.
Numerical modeling of initiation and propagation of corrosion in hollow submerged marine concrete structures
When reinforced concrete structures exposed to marine environments have both water-saturated and aerated parts, for instance, submerged tunnels or parking areas, a macrocell can develop. The electrochemical potential and the corrosion rate of reinforcing steel in the saturated part may increase because of this phenomenon. The goal of this paper was to study the effects of macrocells during corrosion initiation and propagation through numerical simulations of a wall separating a dry environment from seawater. When steel bars are passive, the potential of rebars in saturated concrete is increased by the macrocell and steel depassivation is promoted. After corrosion initiation, steel corrosion rate is increased by several orders of magnitude and the macrocell promotes also the localization of corrosion. A sensitivity analysis was carried out to investigate the influence of the main parameters: the models showed that some electrochemical parameters, such as the cathodic Tafel slope of the steel polarization curve, have a strong influence on the results.
Numerical modeling of initiation and propagation of corrosion in hollow submerged marine concrete structures
Numerische Modellierung der Korrosionseinleitung und -ausbreitung in hohlen Untermeerwasser-Betonstrukturen
Pergola, A. Della (author) / Redaelli, E. (author) / Lollini, F. (author) / Bertolini, L. (author)
Corrosion, Houston ; 69 ; 1158-1170
2013
13 Seiten, 13 Bilder, 2 Tabellen, 28 Quellen
Article (Journal)
English
Korrosionseinleitung , numerische Modellierung , Beton , numerische Simulation , Depassivierung , Stahlkorrosion , Stahlbetonbau , Polarisationskurve , Meeresumwelt , Korrosionsgeschwindigkeit , elektrochemisches Potenzial , Meerwasserkorrosion , Unterwasserumgebung , Meerwasser , Stahlbeton , meerestechnische Unterwasseranlage , Unterwasserbauwerk
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