Abstract
Thermal analysis is a very effective method for the study of the hydration process of cement. This paper focuses on the interactions between the alite–belite–ferrite phase system and different amounts of gypsum by isothermal calorimetry and thermogravimetric analysis. These heat evolution results show that the addition of gypsum could shorten the induction period and promote to a higher hydration rate in the acceleration period. XRD analysis results show that the gypsum mainly promotes the hydration rate of alite at early age and the hydration rate of alite is faster than ferrite phase. Moreover, no observable differences are recorded in the hydration rate of alite–belite–ferrite phase system in the later stage according to the values of hydration degree calculated by the method of Monteagudo. Lastly, the compressive strength of the alite–belite–ferrite phase system with gypsum increases with the increasing amounts of gypsum at all ages up to 28 days. The sample with 5 mass% gypsum shows the best performance in terms of the mechanical property development. The proper concentration of sulfate is beneficial to the hydration process of alite–belite–ferrite phase system.
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Acknowledgements
The authors gratefully acknowledge the financial support of the National Key Research and Development Program (Grant No. 2016YFB0303505), the National Natural Science Foundation of China (Grant No. 51772129) and the 111 Project of International Corporation on Advanced Cement-based Materials (No. D17001).
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Li, C., Lu, X., Jing, G. et al. The effect of gypsum on the hydration of alite–belite–ferrite phase system. J Therm Anal Calorim 136, 717–724 (2019). https://doi.org/10.1007/s10973-018-7643-7
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DOI: https://doi.org/10.1007/s10973-018-7643-7