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  Scopus ID: 21100926589

Effect of Alkali-activation on Elaboration of a Binder Based on Ground Coal Gangue

Azzedine Moussadik, Fatima Ouzoun, Hind Agourrame, Hassan Ez-zaki, Mohamed Saadi and Abdeljebbar Diouri

Abstract

The storage and accumulation of coal waste have adverse effects, including the utilization of valuable land resources, air pollution, and the potential for groundwater contamination. To address these challenges, this study investigated the feasibility of utilizing coal gangue as a raw material for alkali-activated binders, focusing on the influence of different sodium hydroxide (NaOH) concentrations. The coal gangue samples were subjected to various activation conditions using sodium hydroxide (NaOH) solutions of different concentrations (5 M and 12 M). The resulting binders were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric-differential thermal analysis (TG-DTA). XRD analysis confirmed successful activation, with higher NaOH concentrations resulting in increased aluminosilicate gel (N-A-S-H) and reduced quartz peaks. FT-IR analysis showed the formation of aluminosilicate, with higher NaOH concentrations leading to more significant gel formation. TG-DTA analysis revealed multiple stages of thermal decomposition and improved thermal stability with higher NaOH concentrations. Overall, the results highlight the influence of NaOH concentration on the properties of alkali-activated binders and emphasize the potential of coal gangue as a sustainable binder alternative.

Published on: September 21, 2023
doi: 10.17756/nwj.2023-s2-003
Citation: Moussadik A, Ouzoun F, Agourrame H, Ez-zaki H, Saadi M, et al. 2023. Effect of Alkali-activation on Elaboration of a Binder Based on Ground Coal Gangue. NanoWorld J 9(S2): S12-S17.

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