| 摘要 |
PROBLEM TO BE SOLVED: To provide a board for embedded form low in generation rate of edge defects or cracks and excellent in adhesiveness with a post-cast concrete even with short standing time in a standing process during manufacturing.SOLUTION: There is provided a board for embedded form 1 having a plurality of salient parts 3 having height of 3 mm or more on a single surface 4, where area of a cross section at height of 3 mm of the salient parts 3 is 10 to 80% based on a projected area of the single surface 4, area ratio of the total surface area of the single surface 4 and the projected area of the single surface 4 is 1.2 to 7.0. The board 1 consists of a hydraulic composition including (a) Portland cement having a composition with alite of 40 to 50 mass%, belite of 30 to 40 mass%, an aluminate phase of 2 to 5 mass%, a ferrite phase of 11 to 14 mass% as values by Bogue calculation, (b) a silica fume having BET specific surface area of 15 o 20 m/g, (c) two kind of other inorganic powders having specific particle sizes, (d) a fine aggregate having maximum particle diameter of 3.5 mm or less, (e) a water-reducing agent and (f) water at specific blending ratio.SELECTED DRAWING: Figure 1 |
