Study on the activity and surface reaction characters of fly-ash in alkaline environment

The effect of temperature, age and the fineness of powders of fly ash on its activity ratio and the surface micro feature of hydrated fly ash, at the alkaline environment with saturated limewater, was studied. The results show that along with the raising of temperature, the activity ratio of fly ash is increasing, but the raising valums are not in the linear, the activity ratio of fly ash has a ultra rise from 60℃ to 80℃. In the environment of saturated limewater at 80℃, the relationship between activity rate and age of reaction is linear, i.e. the age increasing, the ratio increasing, however, there is less interrelationship between activity ratio and the fineness of fly- ash when fly ash powders will be sufficiently separated in saturated limewater.