REFRACTORY COATING MATERIAL, FORMATION OF REFRACTORY COATED LAYER AND REFRACTORY COATED STRUCTURE

摘要

PROBLEM TO BE SOLVED: To obtain a refractory coating material excellent in refractory performances, capable of actualizing deceleration of rise in temperature on the surface of a steel material, etc., to be used, comprising a specific blending condition of at least a hydraulic cement-containing inorganic binder, an endothermic substance and a fixed lightweight aggregate. SOLUTION: This refractory coating material at least comprises 100 pts.wt. of a hydraulic cement-containing inorganic binder (e.g. Portland cement), 15-500 pts.wt. of an endothermic substance (e.g. aluminum hydroxide) and 12-220 pts.wt. of a lightweight aggregate obtained by blending an inorganic lightweight aggregate (e.g. perlite) with an organic lightweight aggregate (e.g. foamed PS) having preferably 0.1-3mm particle diameter in the ratio of 2:1 to 20:1 in the ratio of 100-300vol. pts. based on 100 vol.pts. of the total of the inorganic binder and the endothermic substance. The refractory coating material is added to water to prepare a mortar to be hardened, which is applied to a structural member by spraying or troweling to form a refractory coated layer.