Comparing the steel-concrete interface state and its electrochemical impedance

✍ Scribed by Leila Dhouibi-Hachani; Ezzedine Triki; Jacques Grandet; André Raharinaivo

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 816 KB
• Volume: 26
• Category: Article
• ISSN: 0008-8846
• DOI: 10.1016/0008-8846(95)00214-6

✦ Synopsis

The object of this investigation is to validate a model of electrical impedance of steel-concrete interface, which has been previously published. In this model, a part of the impedance is related with the products formed directly on steel. Another part of the impedance corresponds to the transition zone between steel and concrete. The third part corresponds to the inhomogeneity of the products formed at the interface.

The validation of this model was obtained by testing reinforced concrete specimens made of three cements and aged in solutions containing chloride or sulphate. The results obtained with measuring electrochemical impedance were compared with the actual condition of steel.

RI?SUMd

L'objet de cette etude est de valider un modtle Clectrique publie anterieurement, sur l'impedance de l'interface acier -b&on. Dans ce modble, une par-tie de l'impedance est liee aux produits directement form& sur l'acier. Une autre partie de l'imptdance correspond a la zone de transition entre l'acier et le b&on. La troisibme partie correspond a l'hettrogeneite des produits form& a l'interface.

La validation de ce modele a Cte obtenue en essayant des eprouvette de b&on arm6 at-me, faites avec trois cirnents et placees darts des solutions contenant des chlorures ou des sulfates. Les resultats de mesure d'impedance Clectrochimique ont CtC compares a l'etat reel de l'acier.