| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a cement quick-setting admixture which can stabilize setting properties in low temperature and constant temperature regions and reduce the temperature dependency of setting speed and initial strength development as compared with conventional quick-setting admixtures, a cement composition, and a spraying method using the admixture and the composition. <P>SOLUTION: There are provided (1) a cement quick-setting admixture containing calcium aluminate, gypsum, trona ash, and an alkali metal aluminate; (2) a cement quick-setting admixture of (1) containing 50-200 pts.mass of gypsum, 3-20 pts.mass of trona ash, and 3-20 pts.mass of the alkali metal aluminate per 100 pts.mass of the calcium aluminate; (3) the cement composition containing cement, and a quick-setting admixture of (1) or (2); and (4) the spraying method using the cement composition (3). <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
