| 摘要 |
PROBLEM TO BE SOLVED: To manufacture concrete having a more higher function by improving bleeding characteristics by a method wherein a process in which aggregate and primary water are kneaded, a process in which cement is mixed, etc., are preliminarily provided, and an order in which material to be kneaded is charged, is adjusted. SOLUTION: At first fine aggregate, coarse aggregate and primary water are kneaded. Thereafter, cement is kneaded. After kneading for a specific time, fine mineral powder is mixed (method B). Or, cement and mineral fine powder are mixed (method C). Then, residual water (secondary water) is added, and kneaded. By changing an order of charging materials, especially by making a composition of concrete have a deviation so that especially a ratio of water to cement near an interface of the aggregate becomes low, the bleeding characteristics is effectively improved. Further, for the cement and mineral fine powder, the cement and a part of the mineral fine powder are mixed, and after kneading for a specific time, the residual part of the mineral fine powder may be mixed. |
