| 摘要 |
PROBLEM TO BE SOLVED: To produce an inexpensive and industrial cement composition and a concrete molding product by a centrifugal force capable of simultaneously satisfying the reduction in amount of a discharged aqueous slurry consisting essentially of a cement without deteriorating the slump and strength by including specific three components in the cement. SOLUTION: This cement composition is obtained by including (A) 0.05-1 pt.wt. of a water-reducing agent and/or a high-performance water-reducing agent which are one or more compounds selected from a water-soluble salt of naphthalenesulfonic acid formalin condensate, an alkylarylsulfonate formalin condensate, etc., (B) 25×10<-6> to 0.06 pt.wt. of a metallic salt of a copolymer of anα-olefin and an unsaturated carboxylic acid in which theα-olefin that is a copolymerization monomer is one or more compounds selected from a 2-8C olefin and styrene and the unsaturated carboxylic acid monomer which is the copolymerization monomer of the component B is one or more compounds selected from maleic anhydride, etc., and (C) 125×10<-6> to 0.25 pt.wt. of a setting hardening promoter which is one or more compounds selected form a formate, etc., in 100 pts.wt. cement. |
