Abstract
Kaolin samples obtained from Cameroon were used to produce geopolymer binders. Prior to its application, the raw kaolin samples were activated through the gliding arc plasma treatment using both spatial post-discharge and direct mode. A mixture of sodium hydroxide and silicate was used as the alkaline solution. In order to study the influence of the modifications generated by the gliding arc plasma treatment on the geopolymerization process, X-ray diffraction, thermogravimetric analysis, differential scanning calorimeter and Fourier transform infrared spectroscopy were carried out. In addition, scanning electron microscopy, nitrogen physisorption and compression tests analysis were also carried out on the resulting geopolymer samples to access their mechanical performance. The results showed that the geopolymerization process was not completed at the curing temperature of 90 °C. Plasma spatial post-discharge mode treated kaolin led to 20.48% increase in compressive strength when compared with the geopolymer prepared from raw kaolin.
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Acknowledgements
The authors are grateful to Professor Elimbi Antoine of the University of Yaoundé I (Cameroon) for providing clay samples.
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B. Sop-Tamo: study conception and design, acquisition of data, analysis and interpretation of data, drafting of manuscript, L.N. Tchadjie: methodology, analysis and interpretation of data,writing - review & editing, J.B. Tarkwa: methodology, writing - review & editing, Thamer Alomayri: writing - review & editing, Hasan Assaedi: Writing - review & editing, J. P. Kamseu Mogo: writing - review & editing, J. Baenla: methodology, writing - review & editing, Kamgang-Youbi: writing - review & editing.
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Highlights
The gliding arc plasma treatment affects the geopolymeric reactivity of kaolin.
The gliding arc plasma-treated in spatial post-discharge mode is preferred to gliding arc plasma treatment in direct mode.
kaolin treated in spatial post-discharge mode gives the highest compressive strength.
Hydroxysodalite is the main crystalline phase after the geopolymerization process.
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Sop-Tamo, B., Tchadjié, L.N., Tarkwa, J.B. et al. Effects of Non-thermal Plasma Treatment on the Geopolymerization of Kaolin Clay. Silicon 14, 3641–3652 (2022). https://doi.org/10.1007/s12633-021-01134-z
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DOI: https://doi.org/10.1007/s12633-021-01134-z