Abstract：
The physical and chemical properties are compared to micro bead fly ash and ordinary fly ash. When micro bead fly ash replaces the same amount of cement, the concrete mixture initial condition, work properties and durability of hardened concrete are tested. The results indicate that micro bead fly ash is very little particles, high activity, excellent water reduction, fine filling properties, low water demand ratio, and it is an important component of the ultra-high performance concrete. The micro bead fly ash can improve the fluidity of concrete, reduce viscosity of the ultra-high performance concrete mixture, and reduce concrete pumping resistance. The micro bead fly ash is suitable for application in the ultra-high performance concrete.
