| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement admixture which can make slump-retaining ability excellent to retain fluidity and, at the same time, can realize viscosity of cement compositions so that work becomes easy at a field handling them and can make the state of a cement composition better. SOLUTION: The cement admixture comprises a polycarboxylic acid copolymer having a polyalkylene glycol side chain, said polycarboxylic acid copolymer being constituted of two or more species of copolymers with different acid values. at least one of said two or more species of copolymers with different acid values has an oxyalkylene group containing 3 or more carbon atoms. The polycarboxylic acid copolymer is constituted of two or more species of copolymers having weight average molecular weight of≤20,000. COPYRIGHT: (C)2006,JPO&NCIPI |
