Abstract
In this study, calcium sulfoaluminate (CSA) cement pastes were tested for heat of hydration and chemical shrinkage at temperatures of 20 °C, 30 °C and 40 °C. Apparent activation energy (\(E_{a}\)) values were then calculated using both exponential and hyperbolic methods. The average \(E_{a}\) of the CSA cements ranged from 42.24 to 80.22 kJ/mol, much higher than that of Type I Portland cement (38–45 kJ/mol). \({E}_{a}\) increased slightly with the replacement of silica fume for cement. However, average \({E}_{a}\) decreased by 18.4% when 20% Class C fly ash was used, but increased by 21.3% when 40% Class C fly ash was used. \(E_{a}\) calculated from heat of hydration using the exponential method is 17% lower than that obtained using the hyperbolic method. When the exponential method was used, \({E}_{a}\) values determined using heat of hydration were 30% higher than those obtained using chemical shrinkage.
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Acknowledgements
This work was supported by the State Key Laboratory of Refractories and Metallurgy (Wuhan University of Science and Technology) [grant number ZR201901]; the CRSRI Open Research Program [grant number CKWV2019756/KY]; the National Natural Science Foundation of China (NSFC) [grant number 51608402]; and the China Scholarship Council (CSC) [grant number 201808420105]. The first two authors would like to thank Sichun Wang for helping to revise the manuscript.
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Liao, Y., Gui, Y., Wang, K. et al. Activation energy of calcium sulfoaluminate cement-based materials. Mater Struct 54, 162 (2021). https://doi.org/10.1617/s11527-021-01753-3
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DOI: https://doi.org/10.1617/s11527-021-01753-3