Process for the protection of reinforcement in reinforced...

C - Chemistry – Metallurgy – 23 – F

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C23F 13/06 (2006.01) E04C 5/01 (2006.01)

Patent

CA 2398022

The invention provides a reinforced concrete having improved corrosion resistance in which the content of voids in the concrete at the surface of the steel reinforcement is below 0.8 %, preferably below 0.5 %, more preferably below 0.2 % by area of steel and in which there is a layer of solid alkali, preferably at least one micron in thickness on the steel surface. The reinforced concrete preferably has a chloride threshold level of at least 0.5 % preferably at least 0.8 % by weight of the cement. The invention also provides a process for reducing corrosion of steel reinforcement in concrete which comprises forming a reinforced concrete in which the voids at the steel surface are below 0.5 % by volume and in which there is a layer of solid alkali on the steel surface the layer being at least 1 micron in thickness and covering at least 20 % of the steel surface.

L'invention concerne un béton armé possédant une résistance améliorée à la corrosion et dans lequel le pourcentage de vides au niveau de la surface de l'armature d'acier se situe en dessous de 0,8 %, préférablement en dessous de 0,5 % et idéalement en dessous de 0,2 % par superficie de l'acier, et dans lequel on a déposé, sur la surface de l'acier, une couche d'alcalin solide, d'une épaisseur d'au moins un micron, de préférence. Ce béton armé comprend un niveau de seuil de chlorure d'au moins 0,5 %, et préférablement d'au moins 0,8 % du poids du béton. L'invention concerne également un procédé de réduction de la corrosion de l'armature d'acier dans du béton, ce procédé consistant à former un béton armé dans lequel les vides situés au niveau de la surface de l'acier sont inférieurs en volume à 0,5 %, et dans lequel on a déposé, sur la surface de l'acier, une couche d'alcalin solide dont l'épaisseur est d'au moins 1 micron et qui recouvre au moins 20 % de la surface de l'acier.

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