Effect of the quality and replacing ratio of fly ash on the property of self-compacting concrete

摘要

In order to use fly ash being discharged from the boilers of a coal fired in thermal power station effectively, the authors aimed at self-compacting concrete using high-volume fly ash. However, the qualities of fly ash vary in each of the powerstation. This study shows the effects that the replacing ratio, the qualities and the specific surface area have on the fluidity, the setting time and the carbonation depth about self-compacting concrete including fly ash. The results obtained are asfollows: The fluidity is improved with the decrease of the specific surface area of fly ash. The setting time is increased with the increment of the specific surface area of fly ash. The carbonation depth of self-com-pacting concrete is very susceptibleto the replacing ratio of fly ash. And the effect that the specific surface area of fly ash has on the carbonation depth of self-compacting concrete is small.