| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive for a hydraulic composition that imparts moderate material separation resistance to a hydraulic composition, has moderate material separation resistance after the lapse of a predetermined time since the completion of hydraulic composition production, and can maintain fluidity retention of the hydraulic composition for a long time.SOLUTION: An additive for a hydraulic composition contains: a component A, an anion-modified cellulose nanofiber; and a component B, a copolymer containing at least two or more constitutional units selected from the group consisting of a constitutional unit (I) derived from an unsaturated monomer having an oxyalkylene group, a constitutional unit (II) derived from a monomer consisting of (α-alkyl)acrylate or anhydride, and a constitutional unit (III) derived from an unsaturated carboxylic acid ester monomer.SELECTED DRAWING: None |
