Reference : Assessment of the suitability of gravel wash mud as raw material for the synthesis of...
Scientific journals : Article
Engineering, computing & technology : Civil engineering
Sustainable Development
http://hdl.handle.net/10993/35493
Assessment of the suitability of gravel wash mud as raw material for the synthesis of an alkali-activated binder
English
Thapa, Vishojit Bahadur [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Waldmann, Danièle mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Wagner, Jean-Frank [University of Trier > Department of Geology]
Lecomte, André [University of Lorraine > Institut Jean Lamour]
1-Sep-2018
Applied Clay Science (TOP10 Journal in Mineralogy)
Elsevier Science
161
C
110-118
Yes (verified by ORBilu)
International
0169-1317
1872-9053
Amsterdam
The Netherlands
[en] Gravel wash mud ; Thermally activated clays ; Alkali-activated binder ; Illite ; Kaolinite
[en] Gravel wash mud (GWM), a waste product from gravel mining was dried and processed into a fine powder to be activated by different concentrations of sodium hydroxide (NaOH) solutions for the synthesis of an alkali-activated binder. The GWM powders were thermally treated at five different calcination temperatures 550, 650, 750, 850 and 950°C. The characterisation of the raw material comprises the particle size distribution (PSD) by laser granulometry, the chemical and mineralogical composition by X-ray fluorescence and X-ray diffraction analysis respectively, and simultaneous thermal analysis. The performance of the alkali-activated binders was examined using compression strength tests and the microstructure was observed using scanning electron microscopy (SEM). The GWM was classified as an aluminosilicate raw material with kaolinite and illite as main clay minerals. Furthermore, a mean particle size around 6.50μm was determined for the uncalcined and calcined GWM powders. The SEM images of the developed binders showed the formation of a compact microstructure, however, relatively low strengths were achieved. This preliminary study highlights an example of an aluminosilicate prime material, which shows very promising chemical and mineralogical characteristics, but its suitability for alkaline activation without further additives was not confirmed as far as performance-based criteria are considered.
University of Luxembourg: Laboratory of Solid Structures
Researchers ; Professionals ; Students ; General public ; Others
http://hdl.handle.net/10993/35493
10.1016/j.clay.2018.04.025
https://doi.org/10.1016/j.clay.2018.04.025

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