Effect of Ammonium Citrate Tribasic on the Hydration Reaction and Properties of Magnesium Oxysulfate Cement
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 11
Abstract
In this paper, the hydration reaction and properties of magnesium oxysulfate (MOS) cement modified with ammonium citrate tribasic are discussed and compared with MOS cement without chemical additives. The hydration reaction characteristics, hydration products, mechanical properties, and microstructures of MOS cement prepared with and without chemical additives were characterized by isothermal calorimetry, quantitative X-ray diffraction (QXRD), mercury intrusion porosimetry (MIP), thermogravimetry (TG), and scanning electron microscopy (SEM), and the mechanism of action of the chemical additives–was investigated. The results show that when the molar ratio of is , the basic salt hydrate phase (5·1·7 phase) can be formed in MOS cement with and without chemical additives. However, ammonium citrate tribasic is an effective chemical additive that can (1) adjust the concentration of and OH− ions in the liquid phase through buffering to meet the requirements of the or ion concentration (or pH value) required for the neutralization reaction of MgO particles, (2) strengthen the neutralization reaction of MgO particles, and (3) reduce the hydration reaction of MgO particles to form through the complexation of the complex ions. Therefore, a large amount of the 5·1·7 phase and small amounts of and the amorphous phase are formed in MOS cement with ammonium citrate tribasic, which optimizes the micropore structure and improves its mechanical strength and water resistance.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This study was supported by the Applied Basic Research Project of Qinghai Province (2019-ZJ-7005), the National Natural Science Foundations of China (Grant No. 52002202), and the K. C. Wong Magna Fund of Ningbo. The authors would also like to thank the School of Materials Science and Engineering of the Southeast University, the School of Civil Engineering of the Qinghai University and the College of Material and Metallurgy of the University of Science and Technology Liaoning for providing instruments and equipments.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 11 • November 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 12, 2020
Accepted: Feb 10, 2021
Published online: Aug 19, 2021
Published in print: Nov 1, 2021
Discussion open until: Jan 19, 2022
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