Doubly-protected reinforcing members in concrete

Details Doubly-protected reinforcing members in concrete Doubly-protected reinforcing members in concrete

C - Chemistry, Metallurgy

23

F

C23F 13/04 (2006.01) C23F 13/10 (2006.01) C23F 13/20 (2006.01) E04C 5/01 (2006.01) G01N 17/02 (2006.01)

Patent

CA 2423116

A concrete structure (11) is reinforced with steel rebars (12) coated with essentially pure aluminum (15) upon which aluminum coating is an aluminum oxide layer (15'). This layer of aluminum oxide is in direct contact with the concrete. The Al-coated rebars may be protected in a galvanic circuit using magnesium or other metal baser as a sacrificial anode, or the rebars are cathodically protected with an impressed cathodic current, the current density of which is derived by sensing the corrosion potential at a sensing member of essentially pure aluminum embedded in the concrete, or in concrete outside a zone immediately surrounding the rebars, measuring the corrosion potential at the sensing member relative to a reference electrode until the value stabilizes at a measured stable potential; then an impressed current lower than the corrosion potential of the sensing member is imposed.

On renforce une structure en béton (11) avec des barres d'armature en acier (12) recouvertes essentiellement d'aluminium pur, (15) sur lequel se trouve une couche d'oxyde d'aluminium (15'). Cette couche est en contact direct avec le béton. On peut protéger les barres d'armature en aluminium dans un circuit galvanique en utilisant du magnésium ou toute autre base métallique telle qu'une anode sacrificielle ou on protège les barres d'armature sur le plan cathodique avec un courant interposé. Pour dériver la densité de ce courant, on détecte le potentiel de corrosion au niveau de l'élément de détection d'aluminium pratiquement pur enveloppé dans le béton ou dans du béton à l'extérieur d'une zone entourant lesdites barres, on mesure le potentiel de corrosion au niveau de l'élément de détection en fonction d'une électrode de référence, jusqu'à ce que la valeur se stabilise à un potentiel stable mesuré, puis, on impose un courant interposé plus faible que celui du potentiel de corrosion dudit élément de détection.

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