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Title

Effect of magnesium salt contamination on the microstructures and properties of metakaolinite-based geopolymer: the role of MgCl2 and MgSO4

Author
Corresponding AuthorLi, Lijuan
Publication Years
2022-10-01
DOI
Source Title
ISSN
2238-7854
EISSN
2214-0697
Volume20
Abstract
Ion contamination considerably influences the properties of geopolymers. This study investigated the effects of magnesium chloride (MgCl2) and magnesium sulfate (MgSO4) concentrations on the microstructure and properties of metakaolinite-based geopolymers with Si/Al ratios of 1.3 (adding NaOH) and 1.6 (adding NaOH and Na2SiO3). The chemical structures and compositions of as-obtained geopolymers formed through the alkali acti-vation of kaolinite were characterized through X-ray diffraction, Fourier-transform infrared spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy, while the microstructure was characterised via scanning electron microscopy and mercury intrusion porosimetry. The salt-free geopolymer with a Si/Al ratio of 1.3 exhibited a loose microstructure and hence poor 28-day compressive strength (9.4 MPa). The addition of magnesium salt to the geopolymer did not considerably influence its microstructure and mechanical properties. Comparatively, the geopolymer with a Si/Al ratio of 1.6 exhibited a compact microstructure and high 28-day compressive strength (43.0 MPa). The geopolymer compressive strength gradually decreased with increasing salt concentration. MgCl2 addition induced halite formation, increased pore diameter and pore volume, and reduced Si incorporated into the geopolymer matrix. In contrast, MgSO4 addition resulted in relatively less change in the pore diameter and pore volume and based on NMR result, more Si was incorporated into the geopolymer matrix. Thus, MgCl2 was more detrimental to the mechanical properties of the kaolinite-based geopolymers than MgSO4.
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Others
Funding Project
National Natural Science Foundation of China["12032009","12002091"]
WOS Research Area
Materials Science ; Metallurgy & Metallurgical Engineering
WOS Subject
Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS Accession No
WOS:000860988000004
Publisher
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:3
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/405992
DepartmentAcademy for Advanced Interdisciplinary Studies
Affiliation
1.Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Guangdong, Peoples R China
2.Guangdong Polytech Ind & Commerce, Sch Surveying, Mapping & Remote Sensing Informat, Guangzhou 510550, Peoples R China
3.Foshan Nanhai Lijian Concrete Co Ltd, Foshan 528247, Guangdong, Peoples R China
4.Guangzhou Taihe Concrete Co Ltd, Guangzhou 510540, Guangdong, Peoples R China
5.Southern Marine Sci & Engn Guangdong Lab, Guangzhou, Peoples R China
6.Southern Univ Sci & Technol, Acad Adv Interdisciplinary Studies, Shenzhen Key Lab Nat Gas Hydrates, Shenzhen 518055, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Baifa,Huang, Dongchao,Li, Lijuan,et al. Effect of magnesium salt contamination on the microstructures and properties of metakaolinite-based geopolymer: the role of MgCl2 and MgSO4[J]. Journal of Materials Research and Technology-JMR&T,2022,20.
APA
Zhang, Baifa.,Huang, Dongchao.,Li, Lijuan.,Lin, Min.,Liu, Yong.,...&Xiong, Zhe.(2022).Effect of magnesium salt contamination on the microstructures and properties of metakaolinite-based geopolymer: the role of MgCl2 and MgSO4.Journal of Materials Research and Technology-JMR&T,20.
MLA
Zhang, Baifa,et al."Effect of magnesium salt contamination on the microstructures and properties of metakaolinite-based geopolymer: the role of MgCl2 and MgSO4".Journal of Materials Research and Technology-JMR&T 20(2022).
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