Influence of Uncalcined Coal Gangue on the Microstructure and Properties of Magnesium Ammonium Phosphate Cement
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 8
Abstract
This paper proposes a new method of reusing uncalcined coal gangue (UCG) as a mineral admixture in magnesium ammonium phosphate cement (MAPC) blended with fly ash (FA). The effects of UCG on setting time, workability, hydration heat release, mechanical properties, hydration products, and microstructure of MAPC composites were systematically investigated. The results indicate that the addition of UCG decreased the maximum hydration temperature and extended the setting time of MAPC composites. The compressive strength of MAPC was improved by introducing an optimal amount of UCG. The XRD results showed no new crystal phase in UCG-0 (with 20% FA and 0% UCG) and some secondary hydration products, such as berlinite and lizardite, were observed in MAPC with UCG. The addition of UCG was found to inhibit the generation of dittmarite and promote the development of struvite. Results showed that differences in the crystal morphology of struvite and dittmarite influence the compressive strength of MAPC composites.
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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 was financially supported by the National Natural Science Foundation of China, Grant No. 52278265, and the SJTU-Warwick Joint Seed Fund.
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Aug 15, 2023
Accepted: Jan 16, 2024
Published online: May 17, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 17, 2024
ASCE Technical Topics:
- Chemical compounds
- Chemical elements
- Chemicals
- Chemistry
- Coal
- Compressive strength
- Energy engineering
- Energy sources (by type)
- Environmental engineering
- Fuels
- Geomatics
- Hydration
- Laminating
- Magnesium
- Mapping
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Materials processing
- Microstructure
- Mine wastes
- Non-renewable energy
- Pollutants
- Strength of materials
- Surveying methods
- Wastes
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