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Effect of Na+ ion on the formation and hydration of ye’elimite containing Fe

Guofa Zheng, Xiaolei Lu, Qiang Li, Peng Du, Lina Zhang, and Xin Cheng

Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan, China

 

E-mail: mse_luxl@ujn.edu.cn

Received: 29 December 2021  Accepted: 25 March 2022

Abstract:

The effect of Na2O-doped on the formation and hydration properties of ye'elimite containing Fe (C4A2.8F0.2$) was focused on this study. A combination of x-ray powder diffraction (XRD), infrared spectrum (IR), differential scanning calorimetry (DSC)-thermogravimetric (TG) analysis, and SEM–EDS were used to investigate the microstructure and morphology of C4A2.8F0.2$ with doping Na2O. Hydration kinetics tests were conducted to study the effect of Na2O on the C4A2.8F0.2$ by the isothermal calorimetry and the electrical conductivity. The results show that Na2O-doped promotes the phase transition of ye'elimite from orthogonal to cubic phase. The amount of Na+ ions substituted for Ca2+ ions reaches the limit doping Na2O with a dosage of 0.8 wt%, and the crystal structure of C4A2.8F0.2$ mineral tends to be stable. When the amount of Na2O is more than 0.8 wt%, the formation of C4A2.8F0.2$ is hindered and its content decreases. Besides, adding Na2O promotes the grain growth of the C4A2.8F0.2$, which doubles its average size, and makes the morphology of C4A2.8F0.2$ change from an egg-like shape to an irregular shape. In addition, the hydration process of C4A2.8F0.2$ doping with Na2O is accelerated, the induction period is significantly shortened or even disappeared, indicating Na2O facilitates the exothermic concentration of C4A2.8F0.2$ hydration. However, the addition of Na2O has no obvious effect on the total hydration heat release of C4A2.8F0.2$.

Keywords: Na2O; Doping; Ye'elimite; Crystal structure; Hydration properties

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02199-9

 

Chemical Papers 76 (7) 4531–4539 (2022)

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