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Monitoring of corrosion processes in chloride contaminated mortar by electrochemical measurements and X-ray tomography / M. Beck in Materials and corrosion, Vol. 61 N° 6 (Juin 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 6 (Juin 2010) . - pp. 475–479 Titre : Monitoring of corrosion processes in chloride contaminated mortar by electrochemical measurements and X-ray tomography Type de document : texte imprimé Auteurs : M. Beck, Auteur ; J. Goebbels, Auteur ; A. Burkert, Auteur Année de publication : 2010 Article en page(s) : pp. 475–479 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : contaminated  mortar;  electrochemical  measurements;  pitting  corrosion;  X-ray  tomography Résumé : Corrosion of steel reinforcement in concrete exposed to chloride containing environments is a serious problem in civil engineering practice. Electrochemical methods, e.g., potential mapping, provide information whether the steel reinforcement is still passive or depassivation has been initiated. By applying such techniques no information on the type of corrosion, its extent and distribution of corrosion products is available. Particular the corrosion progress is a significant problem. Especially in the case of macrocell corrosion in reinforced concrete structures, the development at the anode cannot be separated into corrosion damage resulting from macrocell corrosion or self-corrosion. Until now also in laboratory tests it is impossible to collect such information without destroying specimens after electrochemical testing was performed. To overcome this problem it was tried to study the steel surface within the mortar specimens by X-ray tomography (CT). Within the scope of these investigations it could be shown, that X-ray tomography is suitable to make corrosion pits and their development visible which are embedded in a mortar with a cover thickness of about 35 mm. In this publication the time-dependent corrosion damage of reinforced steel is documented by X-ray tomography. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905364/abstract [article] Monitoring of corrosion processes in chloride contaminated mortar by electrochemical measurements and X-ray tomography [texte imprimé] / M. Beck, Auteur ; J. Goebbels, Auteur ; A. Burkert, Auteur . - 2010 . - pp. 475–479. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 6 (Juin 2010) . - pp. 475–479 Mots-clés : contaminated  mortar;  electrochemical  measurements;  pitting  corrosion;  X-ray  tomography Résumé : Corrosion of steel reinforcement in concrete exposed to chloride containing environments is a serious problem in civil engineering practice. Electrochemical methods, e.g., potential mapping, provide information whether the steel reinforcement is still passive or depassivation has been initiated. By applying such techniques no information on the type of corrosion, its extent and distribution of corrosion products is available. Particular the corrosion progress is a significant problem. Especially in the case of macrocell corrosion in reinforced concrete structures, the development at the anode cannot be separated into corrosion damage resulting from macrocell corrosion or self-corrosion. Until now also in laboratory tests it is impossible to collect such information without destroying specimens after electrochemical testing was performed. To overcome this problem it was tried to study the steel surface within the mortar specimens by X-ray tomography (CT). Within the scope of these investigations it could be shown, that X-ray tomography is suitable to make corrosion pits and their development visible which are embedded in a mortar with a cover thickness of about 35 mm. In this publication the time-dependent corrosion damage of reinforced steel is documented by X-ray tomography. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905364/abstract