| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition high in setting rate and hardening rate by containing an Al compound and a Ca compound, which are specified in dissolving quantity and S exudation ratio to water, specific surface area and the pH of the Al compound, in a specific molar ratio of Al to Ca to control the solubility of Al and Ca ion to water. SOLUTION: The molar ratio is 0.1-10 and at least the following condition is satisfied. The Al dissolving quantity of the Al compound to 10 wt.% NaOH aq. solution is >=1000 ppm, the Ca dissolving quantity of the Ca compound to a distilled water at an ordinary temp. is∞300 pm, the S dissolution of both compounds to distilled water at an ordinary temp. is <=50 ppm, the solubility of the Al compound to an alkaline aq. solution having pH 12.5 is∞150 ppm/g, the specific surface area of the Al compound and the Ca compound are respectively 10-50 m<2> and 10-62 m<2> , the Al compound is aluminum hydroxide having pH 10-13 in an saturated aq. solution at an ordinary temp. and has 1-40μm average particle diamete. |
