Corrosion inhibiting composition for reinforced concrete and method of applying same
AssigneeW. R. Grace & Co.-Conn.
InventorsRobert J. Hoopes, Neal S. Berke, Paul G. Tourney, Ahmad Arfaei
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Abstract
A rehabilitative solution for preventing or retarding the spread of corrosion of metal reinforcements in concrete, comprising a) one or more corrosion-inhibiting agent(s) and b) a impregnation-increasing amount of a penetration-enhancing agent selected from the group consisting of C.sub.1 to C.sub.20 alcohols; alkali metal salts of gluconic acid; alkyl-substituted benzene compounds; or mixtures thereof, is disclosed, along with several methods of its application for concrete rehabilitation.
Claims25
A composition for rehabilitating reinforced concrete having steel reinforcements imbedded therein, comprising a solution of
- a) one or more corrosion-inhibiting agents present in an amount sufficient to inhibit corrosion of said steel reinforcements, said one or more corrosion-inhibiting agents selected from the group consisting of alkali metal and alkaline earth metal nitrites;
- zinc nitrate;
- organic ammonium nitrites;
- alkaline earth metal petroleum sulfonates;
- borate salts;
- molybdates;
- amine salts;
- alkanolamines;
- and mixtures thereof;
- and
- b) a penetration-enhancing agent selected from the group consisting of C.sub.1 to C.sub.20 alcohols;
- alkyl-substituted benzene compounds;
- and mixtures thereof,
- wherein said penetration-enhancing agent is present in an amount effective to increase penetration of said corrosion-inhibiting agent(s) into said reinforced concrete.
A method of rehabilitating reinforced concrete, comprising the step of applying, to steel reinforcement-containing concrete to be rehabilitated, a solution comprising
- a) one or more corrosion-inhibiting agents present in an amount sufficient to inhibit corrosion of said steel reinforcements, said one or more corrosion-inhibiting agents selected from the group consisting of alkali metal and alkaline earth metal nitrites;
- zinc nitrate;
- organic ammonium nitrites;
- alkaline earth metal petroleum sulfonates;
- borate salts;
- molybdates;
- amine salts;
- alkanolamines;
- and mixtures thereof;
- and
- b) a penetration-enhancing agent selected from the group consisting of C.sub.1 to C.sub.20 alcohols;
- alkyl-substituted benzene compounds;
- and mixtures thereof,
- wherein said penetration-enhancing agent is present in an amount effective to increase penetration of said corrosion-inhibiting agent(s) into said reinforced concrete.
Dependencies are inferred from the claim text.