| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive for a hydraulic composition capable of securing a favorable pumpability, of inhibiting a slump flow variation and an air volume variation before/after pumping, of ensuring a favorable workability, and of yielding a favorable post-cure freeze/melt resistance.SOLUTION: The provided additive for a hydraulic composition comprises: (A) a specified acrylic acid-based copolymer; (B) a specified acrylic acid ester-based copolymer; (C) a polyethylene glycol having a weight-average molecular weight of 9,000 or above and 18,000 or below; and (D) a polysaccharide derivative obtained by substituting hydrogen atoms of some or all hydroxyl groups of a polysaccharide or alkylated derivative or hydroxyalkylated derivative thereof with specified hydrophobic substituents and specified ionic hydrophilic groups. |
