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Visualising Geopolymerisation Processes Using Scanning X-Ray Diffraction and Fluorescence Microscopy
Grant A van Riessen1, Gerard N Hinsley1,2, Cameron M Kewish1,3
1Department of Mathematical and Physical Sciences, School of Computing, Engineering and Mathematical Sciences, La Trobe University, Bundoora, VIC 3086, Australia.
Materials (Basel, Switzerland)
|December 17, 2024
Summary
Synchrotron X-ray microscopy revealed rapid metakaolin dissolution and immediate geopolymer formation. This study offers new insights into geopolymerization, showing microstructure evolution and pore growth over hours.
Area of Science:
- Materials Science
- Chemistry
- Geochemistry
Background:
- Geopolymers are inorganic polymers with potential applications in construction and waste immobilization.
- Understanding the geopolymerization process is crucial for controlling material properties.
Purpose of the Study:
- To observe the in situ dissolution of metakaolin and subsequent geopolymer condensation.
- To gain new insights into the complex geopolymerization process.
Main Methods:
- Simultaneous acquisition of compositional and morphological information using synchrotron X-ray fluorescence microscopy and scanning X-ray diffraction microscopy.
- In situ observation of geopolymer formation under specific alkali and experimental conditions.
Main Results:
- Complete and rapid dissolution of metakaolin was observed.
- Immediate geopolymer formation occurred following metakaolin dissolution.
- The geopolymer microstructure evolved over several hours, including pore growth.
Conclusions:
- The study provides novel insights into the geopolymerization mechanism.
- Controlled conditions can yield geopolymers with targeted compositions.
- The dynamic evolution of geopolymer microstructure is significant for material development.
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