Cathodic protection of steel within a covering material

C - Chemistry – Metallurgy – 23 – F

Patent

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C23F 13/16 (2006.01)

Patent

CA 2509549

Cathodic protection of an existing concrete structure, including a steel member at least partly buried, such as steel rebar, in the concrete structure, is provided by embedding anodes into a fresh concrete layer applied over an excavated patch and/or as a covering overlay. The anodes are embedded at spaced positions or as an array in the layer and connected to the rebar. A corrosion inhibitor is added into the fresh concrete at least at the interface and more preferably in admixture with the fresh concrete which acts to reduce the flow of ionic current to the steel or between the anode member and the steel in the fresh covering material without significantly increasing the resistivity of the fresh covering material and without inhibiting the ionic current between the anode member and the fresh covering material. In this way the current to the steel in the existing concrete is maximized to maximize the cathodic protection to the existing steel which is the primary target.

L'invention concerne une protection cathodique d'une structure en béton existante comprenant un élément en acier au moins partiellement noyé, notamment une barre d'armature en acier, dans la structure en béton au moyen du collage d'anodes dans une couche de béton frais que l'on applique sur une pastille excavée et/ou sous forme de panneau de doublage de couverture. Les anodes sont collées de manière espacée ou sous forme de réseau dans la couche et reliées à la barre d'armature. Un inhibiteur de corrosion est ajouté dans le béton frais au moins au niveau de l'interface et, de préférence, mélangé avec le béton frais qui sert à réduire l'écoulement d'un courant ionique vers l'acier ou entre l'élément anode et l'acier dans le matériau de couverture frais sans augmenter de manière significative la résistivité du matériau de couverture frais et sans inhiber le courant ionique entre l'élément anode et le matériau de couverture frais. Ainsi, le courant s'écoulant vers l'acier dans le béton existant est maximisé de manière à maximiser la protection cathodique de l'acier existant qui est la cible principale.

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