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US 4,398,959 AGranted
Mortar topping with calcium nitrite
AssigneeW. R. Grace & Co.
InventorsArnold M. Rosenberg, James M. Gaidis, Howard J. Troffkin
Life of this patent
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Abstract
Reinforced concrete structures often suffer corrosion damage. This damage is repaired by removing the layer of distressed concrete around the metal reinforcement and filling in the removed area with a high content calcium nitrite-containing cement based composition.
Claims10
A method of inhibiting corrosion of concrete structure containing metal reinforcement elements therein comprising
- removing a layer of concrete from said concrete structure and
- refilling the removed area of concrete structure with a cement based composition consisting essentially of, in parts by weight, about 5 to 20 parts hydraulic cement, about 10 to 40 parts sand, about 2 to 10 parts water, about 0 to 1 part lime, about 0 to 50 parts aggregate of up to about 0.5 inch diameter, about 0 to 10 parts latex and about 0.5 to 4 parts calcium nitrite, the calcium nitrite being in at least 20 percent by weight of the water content.
A concrete structure capable of inhibiting corrosion comprising
- (a) a concrete structure containing metal reinforcement elements therein;
- said structure being free of calcium nitrite, and
- (b) a layer of cement based composition applied over the exposed surface of the concrete structure (a);
- said cement based composition formed from a mixture consisting essentially of, in parts by weight, about 5 to 20 parts hydraulic cement, about 10 to 40 parts sand, about 2 to 10 parts water, about 0 to 1 part lime, about 0 to 50 parts aggregate of up to about 0.5 inch diameter, about 0 to 10 parts latex and about 0.5 to 4 parts calcium nitrite, the calcium nitrite being in at least 20 percent by weight of the water content.
1 more element
Dependencies are inferred from the claim text.