| 摘要 |
PURPOSE:To obtain a hydraulic cement admixture showing excellent initial fluidity and a flow holding property and also minimized in variation of air quantity accompanied with the lapse of time. CONSTITUTION:A hydraulic cement admixture consists of a water-soluble copolymer whose copolymerization ratio of (a) and (b) monomer components described hereunder is in the range of (a)/(b)=(50/50)-(90/10) and whose weight average molecular weight is >=5000; (a) :N-substd. -alpha,beta-unsatd. monocarboxylic acid amide derivative shown by the next general formula (1), R<1>: hydrogen or lower alkyl group, R<2>: 1-4C straight or branched alklene group, X: hydrogen, alkali metal, alkaline earth metal, orgnoammonium group, (b): ethylenically unsatd. dicarbonic acid anhydride. |
