| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement admixture capable of obtaining a cement composition capable of reducing rebound and having good long term strength development, which cement admixture is also capable of carrying out efficient and economical spraying execution having low environmental load by the use of the cement composition in method of spraying and is used in civil engineering and construction industry and employed in sprayed concrete in tunnel, and provide the cement composition, and also provide a method of using the same. SOLUTION: The cement admixture containing a blast furnace slowly cooled slag fine powder and a quick-setting agent, the cement composition containing cement and the cement admixture, further, the method of spraying using the cement composition containing the blast furnace slowly cooled slag fine powder and the quick-setting agent. |
