Effect of Fly Ash on Expansion Properties of Concrete Added with Expansive Agents

This paper studies the effect of fly ash on expansion properties of mortar and concrete with the addition of expansive agents. It concludes that fly ash have different influence on the expansive effect of concrete with addition of expansive agents, the original fly ash hardly has any effect on the expansion properties of mortar and concrete with the addition of expansive agents. But, the milled fly ash has great effect on expansion properties of mortar and concrete with the addition of expansive agents, and the more the milled fly ash is added, the greater the effect is. Even if content of the original fly ash is over 30 percent, the value of expansive rate of mortar and concrete with addition of the original fly ash is as high as that of mortar and concrete without addition of fly ash. When the content of milled fly ash is over 10 percent, the effect on the expansion properties is weakened. When fly ash and expansive agent added to concrete at the same time, fly ash the original fly ash must be used.