| 摘要 |
PROBLEM TO BE SOLVED: To obtain a concrete composition simultaneously provided with high fluidity and aggregate separation resistance. SOLUTION: The concrete composition contains cement, water, a fine aggregate, a coarse aggregate and additives. A cement dispersant comprising a water- soluble vinyl copolymer having carboxylate and polyoxyethylene groups in one molecule and a water-soluble polyurethane resin are contained as the additives by 0.1-3.0 pts.wt. and 0.01-1.0 pt.wt., respectively, based on 100 pts.wt. cement. The ratio of water to cement is 65-30%.
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