Effects of Curing on Properties of Magnesium Oxysulfate Cement
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 12
Abstract
This paper is based on the basic mechanical properties and volume deformation test, as well as the characterization of hydration products and microstructure properties such as x-ray diffraction (XRD), scanning electron microscope (SEM), and mercury injection method (MIP). The effects of curing on the mechanical properties, hydration product composition, and microstructure of magnesium oxysulfate (MOS) cement were studied. The results show that the carbonation properties of MOS cement are closely related to the standard air curing age after demolding. The curing immediately after demolding is not conducive to the development of compressive strength of MOS cement, while the compressive strength of MOS cement in standard air curing for 14 or 28 days after demolding is increased during curing. The can prevent the continuous hydration of residual MgO to form or 5·1·7 phase, which affects the development of the compressive strength of MOS cement. The appropriate addition of low-calcium fly ash (L-FA) can compensate the effect of on the mechanical properties of MOS cement. During curing, some is transformed into an amorphous phase to increase the compactness of its microstructure and a small amount of reacts with to form . The results provide an important theoretical and experimental foundation for the further study of the effects of on the properties of MOS cement and the use of curing modification.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This work was supported by the National Natural Science Foundations of China (Grants Nos. 52108222 and 51978346), Ningbo Natural Science Foundation (Grant No. 202003N4137) and the K. C. Wong Magna Fund in Ningbo. Meanwhile, the authors would also like to thank the School of Materials Science and Engineering of Southeast University, School of Civil Engineering of Qinghai University and the Institute of Materials and Metallurgy of the University of Science and Technology Liaoning for providing instruments and equipment support.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 12 • December 2022
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© 2022 American Society of Civil Engineers.
History
Received: Aug 25, 2021
Accepted: Mar 22, 2022
Published online: Sep 19, 2022
Published in print: Dec 1, 2022
Discussion open until: Feb 19, 2023
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