Abstract
Taking into account a wide range of potential raw materials in the synthesis of geopolymers, the technological features of their production, in particular, the thermal and moisture parameters of hardening, are one of the key ones that determine the efficiency of the geopolymerization process and, as a result, the qualitative characteristics of the final geopolymer product. The article discusses the effect of various hardening conditions (natural hardening and thermal drying) of geopolymer binding systems based on kaolinite and metakaolin on their physical and mechanical properties. It was found that experimental geopolymer samples based on kaolinite demonstrate an increase in compressive strength by more than 2.6 times after exposure to thermal drying, while for geopolymer samples based on metakaolin, thermal drying, on the contrary, leads to a decrease in strength by 77.6%. The obtained results of the compressive strength, as well as the features of the microstructure of both studied geopolymer systems, indicate differences in the structures of the initial aluminosilicate raw material. This should be taken into account when choosing thermal moisture parameters and hardening conditions. The literature review presented in this study on the influence of hardening conditions for geopolymers on different aluminosilicate raw materials confirmed the results obtained in the work.
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Acknowledgements
This work was realized in the framework of the Program of flagship university development on the base of the Belgorod State Technological University named after V G Shukhov. The work was realized using equipment of High Technology Center at BSTU named after V. G. Shukhov.
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Kozhukhova, N.I., Zhernovskaya, I.V., Danakin, D.N., Teslya, A.Y., Kozhukhova, M.I. (2023). Effect of Structure and Stereochemistry on Metakaolin Reactivity when Geopolymerization. In: Marin, Y. (eds) XIII General Meeting of the Russian Mineralogical Society and the Fedorov Session. GMRMS 2021. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-23390-6_61
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