Mechanism of CaO in Light-Burned Magnesia on the Formation Process, Mechanical Properties, and Water and Chloride Resistance of the 517 Phase
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 6
Abstract
With the continuous exploitation of high-quality magnesite ores, a large number of low-grade magnesite ores with high calcium contents were abandoned, thereby occupying the land, polluting the environment, and causing substantial resource waste. Therefore, resource utilization of low-grade magnesite ores is urgently needed. These low-grade magnesite ores can be used by calcination to prepare raw materials of magnesium oxysulfate (MOS) cement, but CaO could be produced during calcination because dolomite is a dominant mineral. Therefore, this paper mainly studied how CaO affects the formation process, mechanical properties, and water and chloride resistance of the pure 517 phase. Light-burned dolomite (LBD) was used to offer CaO, replacing a certain amount of light-burned magnesia (LBM) in this work. It was found that CaO will react with and to form an amorphous phase that remains stable when curing in air but unstable when immersing in water. When immersed in water, would continue to react with to precipitate gypsum, thus destroying the original structure and reducing the stability of the pure 517 phase. Therefore, in the preparation of MOS cement, attention should be given to the content of CaO, and modifiers should be added to obtain a low solubility calcium compound to reduce the negative effects of CaO on MOS cement.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 6 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 17, 2022
Accepted: Oct 20, 2022
Published online: Apr 7, 2023
Published in print: Jun 1, 2023
Discussion open until: Sep 7, 2023
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