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US 4,285,733 AGranted
Corrosion inhibiting concrete composition
AssigneeW. R. Grace & Co.
InventorsArnold M. Rosenberg, James M. Caidis
Life of this patent
Estimating the term…
Abstract
This invention is directed to a concrete which is capable of inhibiting corrosion of metal pieces contained therein or in contact therewith comprising a high strength concrete formed from hydraulic cement and containing at least about 2 percent Ca(NO.sub.2).sub.2 therein.
Claims10
A method of substantially completely inhibiting the corrosion of metal pieces contained in a reinforced concrete structure comprising
- forming an unset concrete composition by substantially uniformly mixing a concrete mixture formed from hydraulic cement, sand, aggregate and water with at least 2 percent calcium nitrite by weight based on the dry weight of the cement content contained in said concrete mixture wherein the concrete composition is capable of exhibiting a compressive strength of at least 5000 psi at 28 days;
- embedding metal pieces in said unset concrete composition while forming a shaped structure;
- and permitting said composition to set.
A reinforced concrete structure formed from a high strength concrete mixture having metal pieces embedded therein;
- said concrete mixture formed from hydraulic cement, sand, aggregate, water with at least 2 percent calcium nitrite based on the dry weight of the cement content of said concrete mixture and said mixture being capable of exhibiting compressive strength of at least 5000 psi at 28 days of cure.
Dependencies are inferred from the claim text.