Effect of the rate of calcination of kaolin on the properties of metakaolin-based geopolymers

By B. B. K. Diffo, A. Elimbi, M. Cyr, J. Manga, H. T. Kouamo. 2015

177 citations recorded by the source corpus.

Abstract Kaolin samples of the same mass were treated at 700 °C for the same duration of 30 min by varying the rate of calcination (1, 2.5, 5, 10, 15 and 20 °C/min) in order to obtain metakaolins which were used to produce geopolymers. Depending on the nature of each type of material, kaolin, metakaolins and geopolymers were characterized using thermal analysis, chemical analysis, XRD, FTIR, particle size distribution, specific surface area, bulk density, setting time and compressive strength. FTIR and XRD analyses showed that metakaolins except at 1 °C/min contained residual kaolinite whose quantity increased with the rate of calcination of kaolin and which influenced the characteristics of geopolymers. Thus as the rate of calcination of kaolin increased, the setting time increased (226 min (rate of 1 °C/min)–773 min (rate of 20 °C/min)) while the compressive strength reduced (49.4 MPa (rate of 1 °C/min)–20.8 MPa (rate of 20 °C/min)). From the obtained results the production of geopolymers having high compressive strength along with low setting time requires that the calcination of kaolin be carried out at a low rate.

Subfields: Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/5fda322e45f5893b6771ce01aa34deab9efed6cf

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In Civil and Structural Engineering

1. Navid Ranjbar
2. L. Tchadjie
3. S. Ekolu
4. Pascaline Patureau
5. A. Marsh
6. Ö. Cizer
7. Ahmed Khalifa
8. Y. Pontikes

Citations in the corpus

• Enhancing the reactivity of aluminosilicate materials toward geopolymer synthesis (2018, background): “[172] studied the effect of calcination rate on the properties of metakaolin-based geopolymers.”
• Advances in alkali-activation of clay minerals (2020, background): “soak and flash calcination), within soak calcination there is little evidence to suggest that the heating rate itself has any substantial effect [168].”
• Hardening evolution of geopolymers from setting to equilibrium: A review (2020, background): “Besides the role played by the calcination temperature, the calcination rate is another significant parameter in the thermal treatment of aluminosilicate [81].”