| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement admixture having high dispersibility, and imparting a hardened cement excellent strength and durability, capable of preventing degradation of fluidity at high temperatures, and to provide a method of execution of a cement composition using the admixture. SOLUTION: The cement admixture contains a copolymer (A) for the cement admixture and an oxicarboxylic acid compound (B) as essential ingredients in a ratio of 10/90-99.9/0.1 (in wt.%), the copolymer (A has a monomer unit (I) derived from an unsaturated polyalkylene glycol ether monomeric substance (a), represented by general formula (1): YO(R<1> O)nR<2> ...(1) and monomer unit (II) derived from an unsaturated carboxylic acid monomeric substance (b) as essential ingredients, and monomer units (I) and (II) occupy among total monomer units by >=1%, and the monomer unit (I) occupies in ratio of <=50 mol % of total monomer units. |
