| abstract |
[PROBLEMS] To provide a concrete admixture which exhibits excellent effects in both reducing viscosity of high-strength concrete under high shear and suppressing retardation of setting. SOLUTION: The alkylene oxide addition mole number is 80 to 30. 0 polyalkylene glycol (meth) acrylate monomer (A) and alkylene oxide addition mole number of 5 A polyalkylene glycol (meth) acrylate monomer (B) and an acrylic acid monomer or dicarboxylic acid monomer or a monomer thereof (C), (A) / (B) / (C) = 51-80 / 10-45 / A concrete admixture comprising, as an essential component, a copolymer obtained by polymerization at a weight ratio of 1 to 40. |