Admixture for hydraulic cement

摘要

A hydraulic cement composition comprising as an effective component a water-soluble amphoteric polymer obtained by Hofmann degradation reaction of an alpha , beta -unsaturated carbonamide polymer or a copolymer of alpha , beta -unsaturated carbonamide and an anionic monomer having a weight average molecular weight of 1,000-1,000,000. The primary amino group produced as a result of the Hofmann degradation reaction provides excellent cement dispersing capabilities.