Short-term corrosion rate measurement of OPC and HPC reinforced concrete specimens by electrochemical techniques

This paper presents the results of a laboratory investigation in which the applicability of Tafel plot and linear polarization techniques in short-term corrosion rate measurement of reinforcing bar in concrete has been evaluated. One hundred and four OPC and HPC concrete cylinders, fifty-two of each kind and each cylinder with a single embedded reinforcing bar, have been subjected to various controlled conditions, and the corrosion rate of each specimen has been monitored. Results indicate that sodium chloride concentration plays an effective role on the propagation of corrosion,i.e., the higher the NaCl concentration, the higher the corrosion rate.RésuméCe papier présente les résultats d'une recherche en laboratoire sur l'utilité du diagramme de Tafel et de la technique de polarisation linéaire dans la mesure de la variation de la vitesse de corrosion d'une armature dans le béton. Cent-quatre cylindres en béton dont cinquante-deux de bétons ordinaires et cinquante-deux de béton à haute performance, chacun avec une barre d'acier à l'intérieur ont été soumis à plusieurs conditions contrôlées, et la vitesse de corrosion de chaque échantillon a été mesurée. Les résultats montrent que la concentration du chlorure de sodium (NaCl) joue un rôle important dans le développement de la corrosion, c'est-à-dire que plus la concentration de NaCl augmente, plus la vitesse de corrosion augmente.

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