Method for cathodic protection of reinforced concrete

C - Chemistry – Metallurgy – 23 – F

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Details

C23F 13/06 (2006.01) C23F 13/02 (2006.01) C23F 13/16 (2006.01)

Patent

CA 2305759

There is described a method of cathodic protection, electrochemical chloride extraction and realkalisation in reinforced concrete or similar materials, and also reinforcement and crack prevention in concrete (1), comprising the impressing of a direct voltage between the reinforcement in the concrete (1) and a conductive device which is brought into contact with the surface of the concrete (1), and wherein the crack preventing effect is obtained by embedding the device in fresh concrete. The method is characterised in that as conductive device/current distributors there is used a mat (3) of optionally coated, conductive carbon fibres produced by blowing, pressing, weaving or knitting so that the fibres lie in almost every direction, and wherein the fibres are of different thicknesses, wherein the mat further comprises electric conductors (4) in the form of bands or wires of conductive material which are placed over or under the mat (3) or are incorporated therein.

L'invention concerne un procédé de protection cathodique, d'extraction de chlorure et de réalcalisation électrochimique pour béton armé ou autres matériaux analogues, et aussi de consolidation et de prévention des fissures pour béton (1), consistant à appliquer une tension directe entre l'armature du béton (1) et un dispositif conducteur mis en contact avec la surface du béton (1). L'effet préventif vis-à-vis des fissures résulte de l'incorporation du dispositif dans le béton frais. Le procédé est caractérisé en ce que l'on utilise comme type de dispositif conducteur/distributeur de courant un treillis (3) de fibres de carbone conductrices éventuellement revêtues, obtenu par soufflage, pressage, tissage ou tricotage, de manière à étendre les fibres dans presque toutes les directions. Lesdites fibres ont différentes épaisseurs et, en outre, le treillis fonctionne avec des conducteurs électriques (4) sous forme de bandes ou de fils en matériau conducteur que l'on place au-dessus ou au-dessous du treillis (3) ou que l'on incorpore à celui-ci.

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