Study on properties development of the composite cementitious system with milled fly ash of ash dam

Abstract

The performance development of the composite cementitious material system with fly ash and milled fly ash of ash dam were investigated. The results show that, compared with fly ash, the milled fly ash of ash dam with special morphology has not significant morphology effect and microaggregate effect at the initial hydration stage. Under the same conditions, the composite cementitious system of milled fly ash of ash dam has a larger water demand ratio and a longer setting time, and the early strength of concrete is relatively low, but the later strength increases rapidly, which is basically equivalent to the strength of concrete with fly ash. After mixing phosphorous slag powder, the water demand ratio of composite cementing system of the milled fly ash of ash dam is obviously reduced, and the setting time is further prolonged, but the strength of early cementing sand can be improved.