Abstract
Geopolymers are three-dimensional aluminosilicate binder materials developed from various raw materials such as industrial by-products that are rich in reactive silica and alumina. However, a few raw materials that are generated in large quantities such as coal gangue (CG) are observed to be under-utilized due to various factors such as low reactivity and bare understanding of the chemical composition. In order to comprehensively utilize CG as an effective binder for various civil engineering applications, improving its cementitious activity is of primary importance. In this study, the potential to synthesize geopolymer from CG is explored by understanding the geopolymer philosophy and criticality of different treatment methods adopted for generation of geopolymer. From various studies, it is understood that the mechanical properties of geopolymer synthesized are affected by particle size, type of activator, pre-treatment methods, and synthesis conditions. Further, reactivity tests were conducted on uncalcinated and calcinated CG at different temperatures to evaluate efficient proportions for geopolymerization. The results conclude that thermal activation improves the amorphic nature and reactivity of CG. It is further inferred that thermally treated CG-based geopolymer is employed as an effective pozzolanic material in various civil engineering applications for its high degree of reaction.
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Gaddam, A.G., Amulya, G., Yamsani, S.K. et al. Efficacy of Coal Gangue as a Precursor in Synthesis of Geopolymer. Indian Geotech J (2023). https://doi.org/10.1007/s40098-023-00804-6
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DOI: https://doi.org/10.1007/s40098-023-00804-6