| 摘要 |
PROBLEM TO BE SOLVED: To provide a setting accelerator excellent in a setting acceleration effect while never causing a phenomenon exerting adverse influence on the durability of a hardened body such as corrosion of reinforcing bars or an alkali-aggregate reaction, and to provide a cement composition using the setting accelerator. SOLUTION: This setting accelerator for cement comprises calcium carbonate whose particle diameter is less than 0.7μm in average, preferably adjusted in a range of 0.05-0.6μm. This cement composition contains the setting accelerator in an amount of 0.1 pt.mass or more but less than 10 pts.mass based on 100 pts.mass of cement. COPYRIGHT: (C)2006,JPO&NCIPI |
