| abstract |
This invention provides an admixture for a hydraulic composition which can reduce coarse bubbles even at a certain level of trapped air, thereby obtaining a hardened product such as concrete with an excellent surface appearance and which has an excellent storage stability. That is, this invention provides an admixture for a hydraulic composition, which (A) is a polymer or copolymer obtained by polymerizing a polyoxyalkylene group-containing unsaturated carboxylic acid based on ethylene, a (meth) allyl alcohol or a derivative thereof, and (B) contains a mixture with specific oxyalkylene compounds 1), 2) and 3) in a specific ratio: DOLLAR A 1) R¶1¶COO (EO) ¶n1¶ (PO) ¶m1¶H, DOLLAR A 2) R¶2¶ COO (EO) ¶n2¶ (PO) ¶m2¶OCR¶3¶ and DOLLAR A 3) R¶4¶O (EO) n¶3¶ (PO) m¶3¶H, DOLLAR A where the meanings of R ¶1¶, R¶2¶, R¶3¶, R¶4¶, n1, n2, n3, m1, m2, m3, EO and PO have the meanings given in Claim 1. |