VERY FAST SETTING CEMENTITIOUS COMPOSITION WITH HIGH EARLY-AGE COMPRESSIVE STRENGTH

摘要

A method of making a rapid setting composition for cement boards is discl osed. Compositions including portland cement, fly ash, gypsum, alkanolamine and phosphate are disclosed. A synergistic interaction between the alkanolam ine and phosphate increases the effectiveness of accelerating reactions thus allowing for quick setting and increased early-age compressive strength com positions.