Characterization of Phase Microstructure with Different Ratios Based on Calcium Sulfoaluminate Cement
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 7
Abstract
The hydration product gel phase or Al-containing [abbreviated as ] gel phase enables calcium sulfoaluminate cement (CSA) to obtain excellent cementitious properties. The formation of these two gels is closely related to the ratio of Al and Fe in the raw materials. The microstructure and properties of hydration products in CSA are seriously affected by the ratio of Al and Fe, and the effect on the gel cannot be ignored. In order to enable the influence relationship between the ratio of Al and Fe and the gel phase was thoroughly investigated. In this study, with different ratios was synthesized from its chemical composition by sol-gel method, and its microstructure was characterized to determine the formation process of this phase. X-ray diffraction (XRD), thermogravimetric analysis (TGA), inductively coupled plasma emission spectroscopy (ICP), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscope (TEM) and adsorption-Brunauer Emmett Teller (BET) were utilized to investigate the microstructure of with different ratios. The results show that Fe in was substituted by Al to form the phase of goethite crystal structure at . The gradual increase of ratios significantly changed the crystal structure parameters of , and the adsorption capacity and desorption temperature of -OH groups were improved. When the ratio was greater than 40% by mol, the crystal structure of was transformed, and the crystallinity was significantly reduced. In addition, the substitution of Al resulted in a significant decrease in the aspect ratio of the phase particles, the microscopic morphology changed from needle-rod to granular, and a larger specific surface area was obtained.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was supported by the National Natural Science Foundation of China (52172015 and 52008076).
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jul 5, 2022
Accepted: Nov 14, 2022
Published online: Apr 24, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 24, 2023
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