| 摘要 |
<p>Unreinforced or reinforced moulded concrete bodies, for example concrete pipes, having improved corrosion resistance to acids and acidic effluents, improved penetration resistance to inorganic and organic liquids and gases and also improved mechanical strength, prepared by machine-moulding, for example in compression-moulding machines or extrusion machines or concrete pipe-pressing machines, and allowing plastic-viscous concrete mixes of hydraulic inorganic binders, preferably cement, aggregates and water, to harden, and, during the preparation of the plastic-viscous concrete mixes, an effective quantity of an aqueous plastics dispersion based on anionic and hydrolysis-resistant copolymers of ethylenically unsaturated monomers with a minimum film-forming temperature (MFT) above the setting temperature of the concrete mix, preferably above 23 DEG C, being added to the mix in a forced mixer. Use of the moulded concrete bodies as prefabricated concrete components for diverse applications, preferably as building elements in building construction, road construction, bridge construction, civil engineering, in particular in sewer pipe construction for underground effluent lines, and process water lines.</p> |
