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The effect of grain size of CaCO 3 and SiO 2 on the formation of C3S under various conditions, such as rapid heating rate(800℃/min),normal heating rate(30℃/min)and in the presence or absence of ZnO, was studied.The results show that the decomposition temperature of CaCO 3 ,the temperature of appearance of liquid phase and the f-CaO content descend when the grain size of CaCO 3 and SiO 2 becomes smaller,which attributes to the reactive activity enhancement of powders due to the decrease of the particle size.When the grain size of CaCO 3 and SiO 2 is below 1μm,the rate of the formation of C 3 S is greatly raised.A rapid sintering rate and the presence of ZnO have an important effect on the formation of C 3 S and can lower the temperature of the formation of C 3 S by about 50℃.
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. results showed that the decomposition temperature of CaCO 3, the temperature of appearance of liquid phase and the f-CaO content descend when the grain size of CaCO 3 and SiO 2 becomes smaller, which attributes to the reactive activity enhancement of powders due to the decrease of the particle size. When the grain size of CaCO 3 and SiO 2 is below 1 μm, the rate of the formation of C 3 S is greatly raised. A rapid sintering rate and the presence of ZnO have an important effect on the formation of C 3 S and can lower the temperature of the formation of C 3 S by about 50 ° C.