| 摘要 |
PROBLEM TO BE SOLVED: To obtain a quick-hardening material excellent in applicability as well as in the exhibition of strength by incorporating calcium aluminates, an inorg. sulfate, at least one of a metallic sulfate and a metallic carbonate and a powdery water-reducing agent. SOLUTION: Usually (A) 100 pts.wt. calcium aluminates are mixed with (B) 10-200 pts.wt. inorg. sulfate, (C) 1-30 pts.wt. at least one of a metallic sulfate and a metallic carbonate based on 100 pts.wt., in total, of the components A and B and (D) 1-20 pts.wt. powdery water-reducing agent based on 100 pts.wt., in total, of the components A-C. The starting materials are preferably mixed and comminuted and the fineness of the resultant quick-hardening material is usually regulated to >=3,000 cm<2> /g Blaine value. The calcium aluminates are preferably based on crystalline minerals. The inorg. sulfate is preferably anhydrous gypsum. The metallic sulfate is preferably alum. The water-reducing agent is preferably a naphthalenesulfonate-formaldehyde condensation product. |
