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Reinforcement corrosion is one of the major durability problems that need to be solved in order to extend the service life of a structure. It is influenced, on one hand, by the concrete itself, sound or polluted (chlorinated or carbonated), and on the other hand, by the environmental conditions (controlled or outdoor). To explore the influence of temperature and humidity, electrochemical characterisations (potential, linear polarisation resistance and corrosion rate) were carried out on reinforced concrete prisms. A database of more than 3000 values has been delivered. The results enabled us to deduce that both parameters have influences on each other. Moreover, considering the four concretes, the corrosion order obtained in controlled conditions may be different from the one obtained in outdoor conditions.La corrosion des armatures est un problème majeur dans la durabilité du béton qui doit être résolu afin d’augmenter la durée de vie des structures. Elle dépend, d’une part, de la nature du béton (sain ou pollué (chloruré ou carbonaté)) et, d’autre part, des conditions environnementales (contrôlées ou naturelles). Afin d’étudier l’influence de la température et de l’humidité, des caractérisations électrochimiques (potentiel, résistance de polarisation linéaire, courant de corrosion) ont été réalisées sur des prismes en béton armé. Une base de données, avec plus de 3 000 valeurs, a été constituée. Les résultats montrent que les deux paramètres interagissent l’un sur l’autre. De plus, l’ordre de corrosion obtenu dans des conditions contrôlées peut être différent de celui observé dans des conditions naturelles.

AbstractReinforcement corrosion is one of the major structural performance issues that need to be solved to extend the service lifetime of a concrete structure. It is influenced, on the one hand, by the concrete itself sound or contaminated (with chloride or carbonated) and, on the other hand, by the environmental conditions such as temperature and relative humidity (controlled or outdoor). To characterize the corrosion of steel rebar in concrete prisms, several electrochemical measurements such as half-cell potential, linear polarization resistance and impedance were performed and corrosion rates were then calculated. A database containing >3000 values has been established. These data have been firstly analyzed with basic statistics and secondly they have been modeled as symbolic data and studied with a principal component analysis. It is shown that symbolic principal component analysis is a powerful tool leading to more refined results.