Research on the Application Technology of Fly Ash in Ultra High Performance Concrete

Cement: Guangdong Qingxin Conch Cement Co.

, Ltd.

P · Ⅱ 52.

5R cement, with a specific surface area of 437m2/kg, meets the requirements of GB175-2007 “General Portland Cement”; Silica fume: SiO2 content of 96.

34%, specific surface area of 19500m2/kg, produced by Gansu Yuyang New Materials Co.

, Ltd.

, meets the requirements of GB/T27690-2011 “Silica fume for mortar and concrete”; Fly ash microbeads: SiO2 content 56.

5%, specific surface area 2431m2/kg, Tianjin Zhucheng Fly Ash microbeads Co.

, Ltd; Fly ash: Grade I, water requirement ratio of 92%, specific surface area of 645m2/kg, loss on ignition of 4%, 28 day activity index of 72%, Shandong Shunke Building Materials Technology Co.

, Ltd; Mineral powder: S95 grade, specific surface area 448m2/kg, alkalinity 0.

Pfeifer VS Box

91, Shandong Changshengyuan Slag Micropowder Co.

, Ltd.

The main chemical components of cementitious materials are shown in Table 1.

.