| abstract |
[Problem] To provide a hydraulic composition admixture that suppresses blackening caused by colored fine particles, setting retardation or bleeding, and a decrease in initial strength, and has excellent water-reducing properties. [Solution] A hydraulic composition admixture containing: a polycondensation product P, which includes a copolymer obtained by polycondensing a monomer mixture including compounds A-C represented by formulae (A)-(C); and a polycarboxylic acid-based polymer Q, which has a structural unit having an amino group and an imino group, and/or a structural unit having an amino group, an imino group, and an amide group. (In the formulae, R 1 represents a hydrogen atom, an alkyl group, or an alkenyl group, A 1 O represents a C2-4 alkylene oxide group, p represents a number between 1-300 inclusive, X represents a hydrogen atom, an alkyl group, or an acyl group, R 2 represents an alkyl group or an alkenyl group, A 2 O represents a C2-4 alkylene oxide group, q represents a number between 1-300 inclusive, Y 1 represents a phosphate ester group, R 3 represents a hydrogen atom, a carboxyl group, an alkyl group, an alkenyl group, a phenyl group, a naphthyl group, or a heterocyclic group, and r represents a number between 1-100 inclusive.) |