abstract |
(57) [Summary] [Constitution] C2-C3 oxyalkylene group 110-30 0 mol of one or more selected from polyalkylene glycol monoester monomers (a) and acrylic acid monomers, unsaturated dicarboxylic acid monomers and allyl sulfonic acid monomers. A concrete admixture containing a copolymer obtained by polymerizing a monomer (b) as an essential component. [Effect] Since the slump does not change over a long period of time, the quality control of concrete becomes easy. |