Add time:08/08/2019         Source:sciencedirect.com

This work aims to study the effect of the addition of reactive or unreactive aluminosilicate sources on the geopolymerisation reaction, and therefore on the geopolymer's working properties. To this end, six formulations with different metakaolin content, as well as the potential addition of mica fillers, were synthetized and investigated over time. The structural evolution of the reactive mixtures was monitored by FTIR spectroscopy and thermal analysis, whereas the resulting geopolymers were characterized using X-ray diffraction and 27Al NMR. Finally, SEM observations of the microstructures of the consolidated materials were carried out. The results show that a rise in the metakaolin content modifies the dissolution step of the geopolymer formation by decreasing the amount of consumed water from 50 to 34%. Moreover, it increases the initial viscosity by 66% and decreases the setting time by 168 min. Besides, with the addition of mica fillers, the analysis of the FTIR spectra outlines a lower reactivity of the mixture and the formation of several geopolymer networks, ultimately leading to a heterogeneous microstructure. Finally, the mechanical properties are directly related to the level of amorphous phase in the geopolymer sample, the highest values being reached for 85% of amorphous phase.

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