Process for inhibiting corrosion of metal embedded in concrete and a reinforced concrete construction
AssigneeState of California, Department of Transportation
InventorJohn A. Apostolos
Life of this patent
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Abstract
Electrically conductive metal is melted, preferably by a flame, and is sprayed onto a freshly exposed, pitted surface of a concrete member having iron embedded therein. The sprayed metal, when cooled, forms a metal cover on and interlocked with at least part of the newly exposed surface. The cover and the embedded iron are preferably joined in an electric circuit affording a direct current electromotive force, effectively opposite to that which normally would occur, in order to preclude the deterioration of the contained iron.
Claims9
A process for inhibiting corrosion of iron embedded in concrete wherein the concrete has an exterior exposed to a moist, saline environment comprising sandblasting said exterior to remove the existing surface thereof and to leave a newly exposed surface thereon, then promptly flame-spraying a metal onto at least part of said newly exposed surface, to form a cover thereon, and then connecting said cover and said iron in a circuit containing a source of electricity.
A concrete structure reinforced with an interior iron bar and having an external surface that has been substantially unexposed to the atmosphere, a cover of flame-sprayed metal on said surface and disposed between said surface and the atmosphere, and means for subjecting said cover and said iron bar to a current opposing deterioration of said bar.
A concrete structure reinforced with a pre-tensioned interior member of ferrous material and having an external surface that has been substantially unexposed to the atmosphere, a coating of flame-sprayed metal on said surface and disposed between said surface and the atmosphere, and means for subjecting said coating and said ferrous member to a current opposing deterioration of said member.
Dependencies are inferred from the claim text.