| 摘要 |
PURPOSE:To obtain flowing concrete having good fluidity and packing property by adding a polymer such as a polycaroxylic acid-based polymer and a water-soluble polymer which is a copolymer of specific two kinds of compounds to a concrete mix. CONSTITUTION:(A) One or more compounds of a polycarboxylic acid-based polymer, an aromatic aminosulfonic acid-based polymer and a formalin condensate-based compound of a melaminsulfonic acid salt and (B) a water-soluble copolymer having 50000 to 500000 molecular weight and obtained by copolymerizing 25-75mol% compound of formula I with 75-25mol% compound of formula II are added to a concrete mix, with the proviso that in these formulas I and II, R1 and R2 are H or lower alkyl; Y is alkali metal, NH4 or organic base; A is H or CH2OH. Thereby, flowing concrete having 23-27cm slump, 40-70cm slump flow and <=8cm difference H of box heights measured according to a prescribed box packing test method is obtained. This concrete can execute good-quality concrete structure even by slight compaction. |
