| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject water-reducing agent capable of efficiently fluidizing clay constituting the ground without using a large amount of water by using a specific component. SOLUTION: This water-reducing agent comprises at least one selected from (A) a hydroxycarboxylic acid or its salt, (B) a copolymer of acrylic acid, etc., or this salt [having 10<3> to 5×10<5> weight-average molecular weight (hereinafter referred to as molecular weight)], (C) a copolymer of (a) acrylic acid, etc., and (b) an alkyl acrylate, etc., having a 1-8C alkyl group or its salt (having 10<3> to 5×10<5> molecular weight), (D) a copolymer of the component (a) and (c) maleic acid, etc., or its salt (having 10<3> to 5×10<3> molecular weight), (E) a copolymer of (d) acrylic acid, etc., and (e) styrenesulfonic acid, etc., or its salt (having 10<3> to 3×10<5> molecular weight), (F) a copolymer of the components (d), (e) and (b) or its salt (having 10<3> to 5×10<5> molecular weight), (G) calcium ligninsulfonate, (H) a melamine sulfonate-formalin condensate (having 10<3> to 3×10<5> molecular weight) and (I) a formalin condensate of sodium naphthalenesulfonate (having 10<3> to 3×10<5> molecular weight).
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