| 摘要 |
PROBLEM TO BE SOLVED: To provide precast concrete which can be enhanced in durability. SOLUTION: The precast concrete is constituted by arranging a hardened body of a formulation containing at least cement, fine powder of pozzolan, a fine aggregate of a grain size below 2 mm, a water-reducing admixture and water on a front layer. The precast concrete contains inorganic particles having a Blaine specific surface area of 2,500 to 30,000 cm<SP>2</SP>/g and having the Blaine specific surface area greater than that of the cement in the formulation. The inorganic particle can be composed of the inorganic particle A of 5,000 to 30,000 cm<SP>2</SP>/g in the Blaine specific surface area and the inorganic particles B of 2,500 to 5,000 cm<SP>2</SP>/g in the Blaine specific surface area. Also, the precast conrete contains fibers of one or more kinds selected from the group consisting of metallic fibers, organic fibers and carbon fiber in the formulation. COPYRIGHT: (C)2005,JPO&NCIPI
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