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Influence of uncalcined coal gangue on the microstructure and properties of magnesium ammonium phosphate cement
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Wang, Chaofan, Vo, Thanh Liem, Rezania, Mohammad and Chen, Bing (2024) Influence of uncalcined coal gangue on the microstructure and properties of magnesium ammonium phosphate cement. Journal of Materials in Civil Engineering . pp. 1-37. ISSN 0924-0136.
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Abstract
This paper proposes a new method of reusing uncalcined coal gangue (UCG) as a mineral admixture in the 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. Based on the results, it could be determined that differences in the crystal morphology of struvite and dittmarite influence the compressive strength of MAPC composites.
Item Type: | Journal Article | |||||||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction T Technology > TN Mining engineering. Metallurgy |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
Journal or Publication Title: | Journal of Materials in Civil Engineering | |||||||||
Publisher: | American Society of Civil Engineers (ASCE) | |||||||||
ISSN: | 0924-0136 | |||||||||
Official Date: | 16 January 2024 | |||||||||
Dates: |
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Page Range: | pp. 1-37 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Forthcoming | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 29 January 2024 | |||||||||
RIOXX Funder/Project Grant: |
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