| 摘要 |
PROBLEM TO BE SOLVED: To prevent a strength reduction due to the generation of cracks at the time of hardening-shrinkage from generating, and also, improve the surface smoothness by reducing warpage by a method wherein when an unhardened plate-form inorganic material formed body is heat-cure-hardened, the temperature increasing speed of the plate-form inorganic material formed body is made slower than the programming speed of a curing atmosphere. SOLUTION: For a hydraulic composition which becomes a raw material of an unhardened plate-form inorganic material formed body, a composition containing a hydraulic substance such as cement as the major component, and a latent hydraulic substance, etc., such as blast furnace granulated slag can be counted. Also, in the curing-hardening method, the programming speed of the plate-form inorganic material formed body is made slower than the programming speed of the atmosphere in a curing chamber, and as the method, e.g. a method wherein on the rear side of a tray, a heat insulating material is arranged, and the temperature rising of the tray is suppressed, can be counted. Also, as the heat insulating material, e.g. an inorganic heat insulating material such as expanded styrene, and an inorganic heat insulating material, etc., such as expanded silicon having a thickness in a range wherein when the tray is stacked, the tray does not come into contact with the formed body under the tray, can be counted. |
