Admixture for hydraulic composition

A combination for preparation of an admixture for a hydraulic composition, the combination comprising a polycondensation product P containing a copolymer prepared by polycondensation of a monomer mixture containing a compound A of the following Formula (A), a compound B of the following Formula (B), and one or more aldehyde compounds C of the following Formula (C);

• and
• a polycarboxylic acid-based polymer Q including 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 amido group:
• wherein R1 is a hydrogen atom, a C1-24 alkyl group, or a C2-24 alkenyl group;
• A1O is a C2-4 alkylene oxide group;
• p is an average number of moles of alkylene oxide added and a number of 1 to 300;
• and X is a hydrogen atom, a C1-10 alkyl group, or a C2-24 acyl group;
• R2 is a C4-24 alkyl group or a C4-24 alkenyl group;
• A2O is a C2-4 alkylene oxide group;
• q is an average number of moles of alkylene oxide added and a number of 1 to 300;
• and
• Y1 is a phosphate ester group;
• and
• R3 is a hydrogen atom, a carboxy group, a C1-10 alkyl group, a C2-10 alkenyl group, a phenyl group, a naphthyl group, or a heterocyclic group;
• and r is a number of 1 to 100.