CEMENT ADMIXTURE AND CEMENT COMPOSITION COMPRISING THE SAME

摘要

A cement admixture is provided to offer initial dispersability and slump-retaining power even without adding a separate water-reducing agent or slump retainer. A cement admixture is a copolymer of a mixture comprising (1) 65-98wt% of unsaturated polyalkylene ether-based monomer added with at least two alkylene glycols, (2) 1-20wt% of (meth)acrylate-based monomer, and (3) 1-15wt% of (meth)acrylate ester-based monomer. The unsaturated polyalkylene ether-based monomer added with at least two alkylene glycols comprises a monomer represented by a formula 1 of R^(1)O-[(C2H4O)m-(C3H6O)n]-H, wherein R^(1) is a C2-5 alkenyl group, m is an integer of 20-100, n is an integer of 5-20, and the [(C2H4O)m-(C3H6O)n] means a random, addition or block-like addition state. Further, a weight average molecular weight of the cement admixture is 30000 to 70000.