| 摘要 |
PROBLEM TO BE SOLVED: To provide a precast step that is easily manufactured and is excellent in durability. SOLUTION: This precast step is composed of at least cement, pozzolana impalpable powder, a fine aggregate with a particle size of 2 mm or less, a water reducing agent and a cured blend containing water. The precast step may contain inorganic particles the Blain specific surface area of which is 2,500-30,000 cm<SP>2</SP>/g and is larger than that of the cement in the formulation. The inorganic particle is constituted from an inorganic particle A with the Blain specific surface area of 5,000-30,000 cm<SP>2</SP>/g and an inorganic particle B with the blain specific surface area of 2,500-5,000 cm<SP>2</SP>/g. The precast step can contain one or more fibers selected from the group consisting of a metal fiber, an organic fiber and a carbon fiber. COPYRIGHT: (C)2005,JPO&NCIPI
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