| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a concrete composition having a small degree of slump loss by compounding a concrete composition containing fly ash with a reaction product of a copolymer of a specific polyoxyalkylene derivative and maleic anhydride, with a specific polyoxyalkylene derivative. SOLUTION: This concrete composition is obtained by compounding 1m<3> of a concrete composition mainly containing cement, water, fine aggregate and coarse aggregate with 50-300kg of fly ash and 0.1-10kg of the following additive. Additive: a reaction product obtained by the esterification reaction of a copolymer of a polyoxyalkylene derivative expressed by the formula R<1> O (A<1> O)n R<2> [R<1> is a 2-5C alkenyl; A<1> O is a 2-4C oxyalkylene; (n)=5-300; R<2> is a 1-8C hydrocarbon] and maleic anhydride, with a polyoxyalkylene derivative expressed by the formula R<3> O(R<2> O)m H [R<3> is a 1-8C hydrocarbon; R<2> O is a 2-4C oxyalkylene; (m)=1-200], or its salt.</p> |
