Effects of Aluminum Silicate on Mechanical Strength and Microstructural Improvement of Magnesium Phosphate Cement Mortar
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 12
Abstract
This study explored the role of aluminum silicate (AS) on the water stability performance and microstructural properties of magnesium phosphate cement (MPC) composites. Five consecutive dosages of AS were introduced in MPC composites as a substitute for magnesium oxide. It was revealed that MPC composites containing 3% AS exhibited a compressive strength (CS) of around 108.2, 97.1, and 103.4 MPa and a flexural strength (FS) of about 14.9, 13.9, and 14.3 MPa at 28 days in open air, full immersion and cover by wet cloth, respectively, and these results were higher than control and other surrogate mixtures. Additionally, electron microscope, X-ray diffraction, and energy dispersive spectrometer observations confirmed the formation of intermediate crystals along with struvite minerals, which explained the dense microstructure, by reducing the micropores. Moreover, thermogravimetric analysis and differential thermal analysis results demonstrated that crystal water in struvite was lost at around 97.35°C, which was the primary issue behind losing the solid mass of the composite paste in a high heat environment. The outcomes of the study might play a role in field applications of MPC composites blended with AS.
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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 work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51778363 and 51972209).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 21, 2020
Accepted: Apr 23, 2020
Published online: Sep 20, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 20, 2021
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