CEMENT ADMIXTURE AND CEMENT COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a cement admixture capable of diminishing the decline in the initial to mid-term strength of the hardened cement composition despite being formulated with a large quantity of fly ash in cement and thereby of attaining the initial to mid-term strength of the hardened cement composition equal to or higher than the case with using cement formulated with no fly ash. SOLUTION: This cement admixture comprises triisopropanolamine, an oxycarboxylic acid and/or a salt thereof and fly ash. By incorporating cement with this admixture, despite resulting in the other objective cement composition containing a large quantity of fly ash, the initial to mid-term strength of the cement composition after hardened comparable to that of the hardened cement formulated with no fly ash can be attained.