| abstract |
The present invention relates to (i) units derived from an ethylenically unsaturated monomer (a) having a structural unit of 25 to 300 moles of C 2 to C 3 oxyalkylene groups per mole of the monomer. Mol%, (ii) 0.1 to 49.9 mol% of units derived from the monomer (b) of an alkyl, alkenyl or hydroxyalkyl ester of an ethylenically unsaturated mono- or dicarboxylic acid, (iii) ethylenically unsaturated 0.1 to 90 mol% units derived from monomer (c) selected from the group consisting of saturated monocarboxylic acids, salts thereof, ethylenically unsaturated dicarboxylic acids, anhydrides and salts thereof, (iv) optionally , Relating to copolymers of up to 30 mol% of other monomers. This copolymer is used as a concrete and / or mortar admixture that allows the lowest fluidity, regardless of the type of cement, while at the same time maintaining the specific consistency, fluidity (or fluidity) and workability of the concrete. be able to. |