Moroccan clays for potential use as aluminosilicate precursors for geopolymer synthesis

Three Moroccan clays, denoted A1, A3 and A5, were sampled from the Fez region with the aim of potential use as aluminosilicate precursors for geopolymer synthesis. Each clay was subjected to calcination at 700 °C and analyzed using DTA/TG, grain size distribution measurements, XRD, and FTIR spectros...

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Bibliographic Details
Published in:E3S web of conferences 2021-01, Vol.240, p.3001
Main Authors: El Khomsi, Anass, Ghaezouni, Ameni, Idrissi kandri, Noureddine, Zerouale, Abdelaziz, Rossignol, Sylvie
Format: Article
Language:English
Subjects:
Activated clay
Aluminosilicates
Aluminum silicates
Amorphization
Calcite
Carbonates
Chemical Sciences
Clay
Clay minerals
Degree of polymerization
Dolomite
Geopolymers
Grain size distribution
Heat treatment
Heat treatments
Hematite
Kaolinite
Minerals
Precursors
Roasting
Size distribution
Synthesis
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Summary:Three Moroccan clays, denoted A1, A3 and A5, were sampled from the Fez region with the aim of potential use as aluminosilicate precursors for geopolymer synthesis. Each clay was subjected to calcination at 700 °C and analyzed using DTA/TG, grain size distribution measurements, XRD, and FTIR spectroscopy before and after heat treatment. The results showed that the three clays contain kaolinite in different proportions in addition to some associated minerals, such as quartz, hematite, calcite and dolomite. Heat treatment successfully activated the clay by the amorphization of kaolinite, which is essential for geopolymerization. Some other changes were observed in the associated minerals, especially carbonates, which partially or totally decomposed depending on the clay, while other minerals remained intact. The SBET and NBO values are in accordance with the degree of polymerization, and the obtention of consolidated materials is possible by alkali activation of the calcined clays.
ISSN:2267-1242
2555-0403
2267-1242
DOI:10.1051/e3sconf/202124003001