PRECAST STEP

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 cm2/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 cm2/g and an inorganic particle B with the blain specific surface area of 2,500-5,000 cm2/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