Method for rehabilitative and/or protective corrosion-inhibition of reinforcing steel embedded in a hardened concrete structure by means of surface-applied corrosion-inhibiting compositions

A method for the rehabilitative reduction of the corrosion rate of corroded steel reinforcements embedded in a hardened, reinforced concrete structure as well as for the precautionary, protective corrosion inhibition of uncorroded steel reinforcements embedded in a hardened, reinforced concrete structure by impregnation of said hardened reinforced concrete structure, wherein said corrosion-inhibiting composition comprises a solution and/or an emulsion and/or a micro-emulsion of

• a) one or more amino- and/or hydroxyalkylamino compound(s), partially or completely neutralized with one or more acid(s) selected from the group consisting of carbonic acid, phosphoric acid, diphosphoric acid, monofluorophosphoric acid, and partial salts thereof, glycerophosphoric acid, glucosemonocarboxylic acid,
• R12—COOH wherein R12 is a linear or branched C6 to C8 alkyl group,
• wherein R13 is H or a linear or branched
• C1 to C4 alkyl, —OH or —NO2 group,
• HOOC—R14—COOH wherein R14 is a C6 to C8 alkylene group,
• and mixtures thereof, whereby said carboxylic acid(s) may additionally contain one or more hydroxyl groups, in an amount sufficient to inhibit corrosion of said steel reinforcement, and
• b) one or more surfactant(s) providing an enhanced wetting and penetration capability by altering the surface tension, and
• c) one or more water-based or water-thinnable water repellent agent(s) selected from organosilanes and/or organosiloxanes.