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Calibration by gravimetric losses of electrochemical corrosion rate measurement using modulated confinement of the current

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Abstract

The measurement of on site corrosion rate is a technique that has been extended for the increasing necessity to determine the service life of concrete structures. The most reliable method is the Polarization Resistance determination by means of the modulated confinement of the current. In the present paper, a calibration of corrosion rate measurements with the modulated confinement of the current method (MCC) is given, comparing the electrochemical results with the gravimetric losses of the rebars. This gravimetric comparison is the reference for the correct calibration of the corrosion rate measurement, following the RILEM Recommendation of TC 154-EMC. Some concrete slabs with different chloride contents were made. In some cases, a hole was drilled over some steels for an additional chloride introduction during the test in order to develop very localized attack. The comparison of electrochemical and gravimetric metal losses confirms the reliability of the modulated confinement of the current method, except when the concrete is very young due to the very low resistivity. Confinement is then not always reliable when the concrete is very wet, and the attenuation of potential method has to be used instead.

Résumé

La mesure de la vitesse de corrosion sur place est une technique qui a été étendue du fait de la nécessité croissante de déterminer la durée de service d'ouvrages en béton. La méthode la plus fible est la détermination de la Résistance de Polarisation au moyen de l'anneau de garde modulant le courant. Dans ce travail, un calibrage de la mesure de la vitesse de corrosion avec la méthode du confinement modulé du courant (MCC) est etudié et les résultats ont été comparés avec les pertes gravimétriques de l'acier. Cette comparaison gravimétrique est la référence pour le calibrage correct de la mesure de la vitesse de corrosion, selon la Recommandation RILEM de la Commission Technique 154-EMC. Quelques dalles de béton avec différentes concentrations de chlorure ont été fabriquées. Dans certains cas, un trou a été fait sur quelques armatures pour un ajout supplémentaire de chlorure pendant les essais afin de développer une attaque très localisée. La comparaison de pertes électrochimiques et gravimétriques de métal confirme la fiabilité de la méthode du confinement modulé du courant, sauf quand le béton est très jeune, en raison d'une résistivité très basse. Le confinement n'est pas toujours fiable quand le béton est très mouillé, il faut alors utiliser la méthode de l'atténuation du potentiel.

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Editorial Note Dr. Carmen Andrade is a Member of the RILEM Bureau (outgoing, president) as well as a Member of RILEM TAC (Technical Activities Committee) and a RILEM Senior Member. She is the Chairlady of RILEM TC MAM ‘Model assisted life monotoring of corrosion induced damage of reinforced concrete structures’ and she also participates in RILEM TCs 189-NEC ‘Non-destructive evaluation of the ‘covercrete’ (concrete cover)’, LTP ‘Life time performance of materials and structures’, 199-CUA ‘Concrete: use of additions’ and INR ‘Interpretation of NDT results and assessment of RC structures’. The CSIC (Instituto ‘Eduardo Torroja’ de Ciencias de la Construcción, IETcc), Spain, is a RILEM Titular Member. Mrs Isabel Martizez participates in the above-mentioned RILEM TC INR.

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Andrade, C., Martínez, I. Calibration by gravimetric losses of electrochemical corrosion rate measurement using modulated confinement of the current. Mat. Struct. 38, 833–841 (2005). https://doi.org/10.1007/BF02481656

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