| 摘要 |
It is an object of the present invention to provide a hydraulic composition which enables both of high fluidity and material separation reducing and can eliminate the delay of setting. The present invention is directed to a hydraulic composition comprising cement (A), a copolymer (B), a high-performance water reducing agent (C) and a powdery cement admixture (D), wherein the copolymer (B) comprises a repeating unit (I) represented by the following formula (1); (wherein R<SUP>1 </SUP>represents a hydrogen atom or a methyl group. n is an integer of 2 to 4.), and a repeating unit (II) represented by the following general formula (2); (wherein R<SUP>2</SUP>, R<SUP>3 </SUP>and R<SUP>4 </SUP>are same or different and each represents a hydrogen atom, a methyl group or a (CH<SUB>2</SUB>)<SUB>p</SUB>COOM<SUP>2 </SUP>group, and may form a structure of an anhydride when the total number of COOM<SUP>1 </SUP>groups and COOM<SUP>2 </SUP>groups are 2. M<SUP>1 </SUP>and M<SUP>2 </SUP>are same or different and each represents a hydrogen atom, a monovalent metal, a divalent metal, an ammonium group or an organic ammonium group, and p is an integer of 0 to 2).
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