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Study on improving the early strength of fly ash-fluorogypsum cementitious binder

YANG Yuan-xia, ZHOU Shi-qiong, LIU Bao-ju(School of Civil Engineering and Architecture, Central South University, Changsha 410075,China)  
Influence of the cement content (w(C)/%), mass ratio of water to binder (mW/mB) and the activator on compressive strength of fly ash-fluorogypsum cementitious binder (FFC) at early and 28 d age are experimentally studied, and the mechanism is discussed. The results indicate, with the increase of the cement content, the compressive strength of FFC improves at 3 d age. While the fluorogypsum content is high, it decreases at 28 d age. With the reduction of mW/mB, the early compressive strength of FFC enhances slightly. The compressive strength of FFC with activator added is higher than those of FFC without activator. It is increased by 470%, 81%, 190% and 22.6% at 1, 3, 7 and 28 d age, respectively. So activator is a main factor that affects the early strength of FFC.
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