J. Phys. IV France
Volume 136, November 2006
Page(s) 331 - 340
Publié en ligne 22 décembre 2006
Corrosion and Long Term Performance of Concrete in NPP and Waste Facilities
V. L'Hostis, F. Foct and D. Féron
J. Phys. IV France 136 (2006) 331-340

DOI: 10.1051/jp4:2006136033

Electrochemical chloride extraction of a beam polluted by chlorides after 40 years in the sea

V. Bouteiller, A. Laplaud, A. Maloular, R.S. Morelle, B. Duchesne and M. Morin

Laboratoire Central des Ponts et Chaussées, 58 Bd. Lefebvre, 75732 Paris Cedex 15, France

(Published online 22 December 2006)

A beam element, naturally polluted by chlorides after 40 years of a marine tidal exposure, has been treated by electrochemical chloride extraction. The chloride profiles, before and after treatment, show that free chlorides are extracted with an efficiency of 70 % close to the steel, 50% in the intermediate cover and only 5% at the concrete surface. From the electrochemical characterizations (before, after, 1, 2 and 17 months after treatment), the steel potential values can, somehow, indicate a passivity of the rebars, but, this phenomenon is not confirmed by the corrosion current values. Chloride content, 17 months after treatment, continue to decrease on the first cm of the cover.

© EDP Sciences 2006