| abstract |
The present invention provides a cement admixture that exhibits excellent cement dispersibility, can shorten the solidification time of the cement and the cement composition, and can keep the viscosity of the cement composition low, and a cement composition using the cement admixture The purpose is to provide goods. A first copolymer containing a structural unit having an alkenyl group having a specific number of carbon atoms or a salt thereof (A), a second copolymer containing a specific carboxylic acid ester-based structural unit, or The present inventors have found that the above problems can be solved by using a cement admixture in which the salt (B), sulfonic acid compound (C), and oxycarboxylic acid or sugar (D) are mixed, and the present invention has been achieved. [Selection figure] None |