Effect of grain size of CaCO₃ and SiO₂ on the formation of C₃S under different conditions

Abstract

The effect of grain size of CaCO₃ and SiO₂ on the formation of C₃S under various conditions, such as rapid heating rate(800 °C/min), normal heating rate(30 °C/min) and in the presence or absence of ZnO, was studied. The results show that the decomposition temperature of CaCO₃, the temperature of appearance of liquid phase and the f-CaO content descend when the grain size of CaCO₃ and SiO₂ becomes smaller, which attributes to the reactive activity enhancement of powders due to the decrease of the particle size. When the grain size of CaCO₃ and SiO₂ is below 1 μm, the rate of the formation of C₃S is greatly raised. A rapid sintering rate and the presence of ZnO have an important effect on the formation of C₃S and can lower the temperature of the formation of C₃S by about 50 °C.

Keywords

grain size / C₃S; rapid sintering / ZnO

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