Mechanical transformation of phyllite mineralogy toward its use as alkali-activated binder precursor
Adesanya, Elijah; Ohenoja, Katja; Yliniemi, Juho; Illikainen, Mirja (2019-10-17)
Elijah Adesanya, Katja Ohenoja, Juho Yliniemi, Mirja Illikainen, Mechanical transformation of phyllite mineralogy toward its use as alkali-activated binder precursor, Minerals Engineering, Volume 145, 2020, 106093, ISSN 0892-6875, https://doi.org/10.1016/j.mineng.2019.106093
© 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/BY-NC-ND/4.0/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2019110636869
Tiivistelmä
Abstract
The mechanical activation of phyllite for use as an alkali-activated material was studied. Prolonged milling of phyllite resulted in reduced particle size and a structural reorganization of the material, leading to incremental increases in amorphous content, which further resulted in the improved reactivity of phyllite in an alkaline environment. Quantitative X-ray diffraction results showed that the phyllite consisted of quartz, muscovite, chamosite, albite, and X-ray amorphous phases. Among the crystalline phases, muscovite and chamosite underwent the most structural reorganization, leading to a more disordered structure due to prolonged and intensive milling. The structural reorganization was also established through Fourier-transform infrared spectroscopy. Dissolution tests in 6 M NaOH showed incremental increases in leached Al and Si elements with increased milling time. After geopolymerization of mechanically activated phyllite, calorimetric studies showed exothermic reactions, and a 28-day compressive strength of 25 MPa was achieved for paste samples cured at room temperature. This study ascertained the potential utilization of phyllite mineral waste in sustainable cement applications.
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