| 摘要 |
PROBLEM TO BE SOLVED: To provide a board for a buried mold having high compressive strength, allowing weight reduction by reducing a thickness, for example, and offering high durability against wear.SOLUTION: A board 1 for a buried mold has a plurality of protruded parts 3 measuring 3 mm or more in height on one surface 4, such that a cross-section area in the 3 mm height direction of the protruded part 3 is 10 to 80% of a projected surface area of the surface 4, and a ratio between an entire surface area of the surface 4 and the projected surface area of the surface 4 is 1.2 to 7.0. The board for a buried mold includes cement, silica fume with a BET specific surface area between 15 and 25 m/g, inorganic powder having a 50%-volume cumulative grain diameter between 0.8 and 5 μm, an aggregate with the greatest grain diameter of 1.2 mm or less, a high-performance water-reducing agent, a defoaming agent, and water. The board 1 for a buried mold is made of a cement-based hardening body, such that of a total of 100 vol.% of the cement, the silica fume and the inorganic powder, the cement accounts for 55 to 65 vol.%, the silica fume accounts for 5 to 25 vol.%, and the inorganic powder accounts for 15 to 35 vol.%.SELECTED DRAWING: Figure 1 |
