| abstract |
(57) [Problem] To provide a cement dispersant and a concrete composition containing the dispersant, all of which satisfy water-reduction, persistence of slump flow, strength development and the like. (A) Polyamide polyamine or an alkylene oxide adduct thereof, (B) (meth) acrylic acid or an alkali metal, ammonium or alkanolamine salt thereof, and (C) a polyalkylene glycol ester of (meth) acrylic acid. A: B: C = 10-4 A cement dispersant containing a water-soluble amphoteric copolymer copolymerized at a ratio of 0:10 to 40:50 to 80 (% by weight) as a main component (particularly, a dispersant for ultra-high-performance concrete). Concrete composition containing the dispersant (especially ultra high performance concrete). |