| 摘要 |
PROBLEM TO BE SOLVED: To provide a powder rapid hardening agent having excellent rapid hardening properties and strength development.SOLUTION: Provided is a powder rapid hardening agent comprising aluminum sulfate of 100 pts. and a bisphenol based condensate of 0.01 to 7 pts. The hydration number of the aluminum sulfate is preferably 6 to 18. The average molecular weight of the bisphenol based condensate is preferably 1,000 to 30,000. As the bisphenol based condensate, bisphenol S is preferable. Further, a fluorine compound, carboxylic acids and gypsum may be included therein. Also provided is a spraying method where cement and the powder and the powder rapid hardening agent are mixed. |
