Abstract
The circumstances in which calcium sulfoaluminate (CSA) cements used are multivariate. Considering the curing temperature greatly influence the formation of hydrates, the hydration of CSA cement containing increasing amount of anhydrite which cured at different temperature was analyzed by calorimetry, XRD and DTA-TGA. And the setting time and mechanical strength are measured to explore the correlation between the microstructure revolution and macroscopic performance. Results illustrate that the hydration of prepared CSA cement is highly dependent on the curing regimes and anhydrite dosage. The addition of anhydrite prolongs the setting of CSA cement at 5 °C, while it accelerates the setting at 20 °C and 40 °C. The usage of anhydrite is detrimental to strength development of CSA cement mortars which cured at 5 °C and 20 °C, but it’s the opposite at 40 °C. Additionally, elevated curing temperature favors the formation of ettringite, alumina gel and monosulfate within 1 d. CSA cement prepared with higher amount of anhydrite is beneficially used in the hot environment.
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Acknowledgements
The work was supported by the National Key Technology R&D Programs in the 13th Five-year Plan of China (2016YFC0700905), National Natural Science Fund of China (51878479, 51978505), Shanghai Rising Star Program (20QC1400600), Sichuan Science and Technology Program (2019YFSY0018) and Sichuan Huashi Group Co., LTD. Additionally, thanks are extended to the anonymous reviewers whose suggestions improved this manuscript.
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Xu, L., Tang, C., Li, H. et al. Hydration characteristics assessment of a binary calcium sulfoaluminate-anhydrite cement related with environment temperature. J Therm Anal Calorim 147, 3053–3061 (2022). https://doi.org/10.1007/s10973-021-10730-5
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DOI: https://doi.org/10.1007/s10973-021-10730-5