Preparation and Characterization of Magnetite-Based Iron Phosphate Cement
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 2
Abstract
Iron phosphate cement (IPC) was prepared through the reaction between magnetite and phosphoric acid. The influences of magnetite-to-phosphoric acid () mass ratio on the hydration temperature, setting behavior, compressive strength, hydration product, and microstructure of IPC pastes were investigated. Results showed that an increase in the ratio can slow down the setting reaction and lower the peak hydration temperature. The compressive strengths of IPC pastes at different ages first increased and then decreased with the increasing from 2.3 to 5.5. The of 2.6 generates the highest compressive strengths for IPC pastes specimens at different ages, which were 21, 27, 30, and 33 MPa at 1, 3, 7, and 28 days, respectively. Furthermore, multiple characterizations including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS) revealed that the amorphous iron phosphate phase was mainly formed as the binder phase and the transformation of Fe (II) into Fe (III) occurred during the formation of IPC hydration products.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors appreciate the financial support from the National Natural Science Foundation of China (Nos. 21866018 and 51662024) and the Yunnan Ten Thousand Talents Plan Young & Elite Talents Project (No. YNWR-QNBJ-2018-388).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 2 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jan 8, 2021
Accepted: Jun 3, 2021
Published online: Nov 26, 2021
Published in print: Feb 1, 2022
Discussion open until: Apr 26, 2022
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