DYNAMIC COPOLYMERS FOR WORKABILITY RETENTION OF CEMENTITIOUS COMPOSITIONS

摘要

A process for the production of high early strength cementitious compositions includes mixing hydraulic cement, aggregate, water, and a slump retention admixture, wherein the slump retention admixture is a dynamic copolymer containing residues of at least the following monomers: A) a ethylenically unsaturated dicarboxylic acid, B) an ethylenically unsaturated alkenyl ether having an C2-4 oxyalkylene chain of about 1 to 25 units, C) an ethylenically unsaturated alkenyl ether having an C2-4 oxyalkylene chain of 26 to about 300 units, and D) an ethylenically unsaturated monomer comprising a moiety hydrolysable in the cementitious composition, wherein the monomer residue when hydrolyzed comprises an active binding site for a component of the cementitious composition. The present method is useful in the production of precast, ready mix, and/or highly filled cementitious compositions.