| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a concrete composition little in slump loss by adding blast furnace slag particles and a specific esterification product produced from a polyoxyalkylene derivative to a concrete composition. SOLUTION: This concrete composition comprises a concrete composition containing a cement, water, a fine aggregate and a course aggregate as main components, blast furnace slag particles in an amount of 50-400kg per m<3> of the concrete composition, and 0.1-10kg of the below-mentioned component F. The component F is an esterification reaction product obtained by esterifying the copolymer of a polyoxyalkylene derivative of formula I: R<1> O(A1 O)n R<2> [R<1> is a 2-5C alkenyl group; A<1> O is a 2-4C oxyalkylene group; R<2> is a 1-8C hydrocarbon group; (n) is 5-300] with maleic acid anhydride with a polyoxyalkylene derivative of formula II: R<3> O(AO)m H (R<3> is a 1-8C hydrocarbon group; A<2> O is a 2-4C oxyalkylene group; (m) is 1-200] in such a condition that the ratio of the number of the maleic anhydride residues in the copolymer to the number of the hydroxyl groups in the compound of formula II is 1:0.1 to 1:1.5, or a salt of the esterification reaction product.</p> |
