| 摘要 |
PURPOSE:To improve pH control effect, long-term stability and strength by blending alumina cement, an expanding admixture and a boric acid compound. CONSTITUTION:With 100 pts.wt. mixture composed of 80-98 pts.wt. alumina cement having >=3000cm<2>/g Blaine specific surface area and 20-2 pts.wt. expanding admixture (e.g. calcium aluminate) having >=2000cm<2>/g Blaine specific surface area, 0.05-5 pts.wt. boric acid compound (e.g. sodium borate) and, as necessary, powdery lime stone having >=80wt.% CaCO3 content and <=100 mesh grain size are blended. |
