METHOD FOR DELAYING THE CARBONATIZATION OF REINFORCED CONCRETE.

摘要

1. Process for delaying the carbonation of reinforced concrete by applying a coating composition, which is based on acrylate polymers and which cures to give a coating having a high diffusion resistance for carbon dioxide, to the surface of the reinforced concrete, characterised in that a coating composition is applied which, as the binder, contains A) a 20 to 70% aqueous dispersion of a copolymer A having a glass transition temperature from 0 to 50 degrees C and consisting of a) methyl methacrylate, styrene, vinyl, acetate, tert.-butyl acrylate and/or vinyl chloride and, if appropriate, additionally acrylonitrile and b) (meth)acrylates of alkanols having 2 to 8 C atoms and/or vinyl propionate, which c) contain 0.5-10% of their weight of copolymerised monocarboxylic and/or dicarboxylic acids containing 3 to 5 C atoms and/or amides thereof, which may be substituted on the nitrogen atoms by alkyl and/or alkylol radicals containing 1 to 4 C atoms, and d) 0.5-10% of their weight of copolymerised monomers containing carbonyl groups, B) 0.05-1 mol of water-soluble aliphatic dihydrazine compounds per mol of carbonyl groups contained in the copolymers A and C) 0.000 2 to 0.02 mol of water-soluble zinc, manganese, cobalt and/or lead salt per mol of dihydrazine compound.