| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a concrete composition, while suppressing the exhaust amount of carbon dioxide, which can secure satisfactory applicability in a state where the reduction in the fluidity and the reduction in an air amount with the lapse of time in the prepared concrete composition are suppressed, further can suppress the drying shrinkage of the obtained hardened body, and can make the required strength appear in the obtained hardened body as well. <P>SOLUTION: The concrete composition at least comprises a binder, water, fine aggregate, coarse aggregate and an admixture. As the binder, the following blast furnace slag composition is used, and also, the mass ratio of water/the blast furnace slag composition is regulated to 30 to 60%. The blast furnace slag composition is obtained, per 100 pts.mass of a mixture comprising blast furnace slag fine powder having fineness of 3,000 to 13,000 cm<SP>2</SP>/g in a ratio of 80 to 95 pts.mass and gypsum in a ratio of 5 to 20 pts.mass (total 100 mass%), by adding regenerated concrete fine powder with a calcium hydroxide content of 3 to 15 pts.mass separated from dismantled concrete in a ratio of 3 to 15 pts.mass. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
