THE ACCELERATING OR RETARDING EFFECT OF FLY ASH ON THE EARLIER AGE HYDRATION OF PORTLAND CEMENT

摘要

The hydration-effecting factor Eh is proposed to analysis and to quantify theaccelerating or retarding effect of fly ash on the hydration process of cement. If Eh > 1,fly ashaccelerate the hydration process of cement,the greater the value of Eh,the greater theaccelerating effect of fly ash. If Eh < 1,fly ash retarding the hydration process of cement,thesmaller the value of Eh,the greater the retarding effect of fly ash. The expression andcalculation method of Eh is also proposed in this paper. On the basis of experiments,Eh of flyash in different groups with varies mixing ratios is calculated and used to indicate theaccelerating effect or retarding effect of fly ash on the hydration process of cement.