| abstract |
A cement dispersant (especially a dispersant for concretes withnultrahigh performance) comprising as a main component a water-solublenamphoteric copolymer obtained by copolymerizing (A) anpolyamide-polyamine of an alkylene oxide adduct thereof with (B)n(meth)acrylic acid or an alkali metal, ammonium, or alkanolaminensalt thereof and (C) a polyalkylene glycol ester of (meth)acrylicnacid in an A/B/C ratio of (10-40)/(10-40)/(50-80)(wt.%); and anconcrete composition (especially an ultral high-performancenconcrete) containing the dispersant. The dispersant satisfies allnof a water-reducing effect, slump flow retention, strengthndevelopment, etc. |