| 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, and in which, as the binder, the following blast-furnace cement composition is used, and also, the mass ratio of water/the blast-furnace cement composition is regulated to 30 to 60%. The blast-furnace cement composition is obtained, to a mixture of 100 pts.mass comprising gypsum in a ratio of 5 to 20 mass% and portland cement in a ratio of 5 to 35 mass% (total 100 mass%), by adding regenerated concrete fine powder separated from dismantled concrete and having a calcium hydroxide content of 3 to 15 mass% in a ratio of 10 to 30 pts.mass. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
