Concrete molding with improved acid resistance

A molded unreinforced or reinforced concrete molding, which may also be a concrete pipe, bound by hydraulic inorganic binders, with improved corrosion resistance to acids and acidic sewage, improved penetration resistance to inorganic and organic liquids and gases and improved mechanical stability, produced by molding and hardening of plastic-viscous concrete mixtures of hydraulic inorganic binders, which may comprise cement or contain cement, aggregates and water, which additionally contains finely distributed plastics components from anionic dispersion copolymers prepared from ethylenically unsaturated monomers by copolymerization, are hydrolysis resistant with respect to the hydraulic inorganic binder and with respect to the hydraulic inorganic binder and with respect to acidic sewage and have been mixed with the plastic-viscous concrete mixtures as an aqueous plastics dispersion which is compatible with the hydraulic inorganic binder and whose minimum film forming temperature (MFT) is above the hardening temperature of the plastic-viscous concrete mixtures;

• the glass transition temperature T.sub.g) of the anionic dispersion copolymer is higher than 23.degree. C., and the anionic dispersion copolymer contains, in each case based on the dispersion copolymer, 0.05 to 5% by weight of monomer units selected from the group consisting of ethylenically unsaturated sulfonic acids and ethylenically unsaturated phosphonic acids and, 0.05 to 1.5% by weight of monomer units from ethylenically unsaturated monomers with organosilicon radicals, which may be reactive, or contains 0.05 to 1.5% by weight of epoxysilanes mixed with the aqueous plastics dispersion.