Patent ID: 7345103

Claim:
A hydraulic composition comprising cement (A), a copolymer (B), a high-performance water reducing agent (C) which is a polycarboxylic acid based high-performance water reducing agent, and a powdery admixture for cement (D) being at least one species selected from the group consisting of blast-furnace slag, fly ash and limestone, wherein the copolymer (B) comprises a repeating unit (I) represented by the following formula (1); wherein R 1 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 2 , R 3 and R 4 are same or different and each represents a hydrogen atom, a methyl group or a (CH 2 ) p COOM 2 group, and may form a structure of an anhydride when the total number of COOM 1 groups and COOM 2 groups are 2. M 1 and M 2 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 and wherein said copolymer (B) has a weight average molecular weight of 600,000 to 10,000,000.