The impact of Fe dosage on the ettringite formation during high ferrite cement hydration

DW Wan and WQ Zhang and Y Tao and ZH Wan and FZ Wang and SG Hu and YJ He, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 104, 3652-3664 (2021).

DOI: 10.1111/jace.17640

Illustrating the influence of Fe dosage and temperature on the formation of sulfoaluminate hydrates is of great significance to understand the early hydration process of high ferrite cement under steam curing. Herein, the impact of Fe dosage on the ettringite formation at different temperatures was revealed through the combination of experiments and computational simulations. A Fe dosage no more than 20% conspicuously accelerated the crystal growth of ettringite by increasing the surface energy in the (0 0 1) direction, whereas a higher dosage suppressed the formation of ettringite as the high incorporation of Fe ions into the ettringite crystal was energetically unstable. The chemical environment analysis of Fe in products shows that Fe(OH)(6)(3-), compared with Al(OH)(6)(3-), prefers to participate in the formation of Al2O3-Fe2O3-mono than ettringite, which is also confirmed by the calculated thermodynamic properties' results. The understanding of the impact and mechanism of Fe on the formation of ettringite under steam curing conditions plays a pivotal role in the utilization of high ferrite cement.

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