| 摘要 |
A hydraulic composition comrising 100 parts by weight of a hydraulic substance and as a water-reducing admixture 0.01-2.0 parts by weight of a water-soluble polymer, said polymer being selected from the group consisting of a specific water-soluble olefin-ethylenically unsaturated dicarboxylic acid salt copolymer and a specific derivative of said copolymer.
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