On the hydration of synthetic aluminosilicate glass as a sole cement precursor
Alzeer, Mohammad I. M.; Nguyen, Hoang; Fabritius, Tapio; Sreenivasan, Harisankar; Telkki, Ville-Veikko; Kantola, Anu M.; Cheeseman, Christopher; Illikainen, Mirja; Kinnunen, Päivö (2022-06-06)
Mohammad I.M. Alzeer, Hoang Nguyen, Tapio Fabritius, Harisankar Sreenivasan, Ville-Veikko Telkki, Anu M. Kantola, Christopher Cheeseman, Mirja Illikainen, Paivo Kinnunen, On the hydration of synthetic aluminosilicate glass as a sole cement precursor, Cement and Concrete Research, Volume 159, 2022, 106859, ISSN 0008-8846, https://doi.org/10.1016/j.cemconres.2022.106859
© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
This paper reports on the synthesis and characteristics of a novel aluminosilicate glass-based cementitious binder. We investigated the hydration kinetics, degree of reaction, and phase assemblage of the glass via XRD, DTG, ²⁷Al and ²⁹Si MAS NMR, FTIR, SEM/EDS and thermodynamic modelling. The glass exhibits hydraulic properties in which the binder developed impressive compressive strength at early age. The main hydration products are an intermixed of Na and/or Al incorporated in C–S–H gel. Hydrotalcite precipitated with slower rate and thus may generate crystallization pressure on the binder at late stage. The glass reached a high degree of hydration (ca. 73 % based on quantitative ²⁹Si NMR analysis) without using any activators or co-binding systems. Therefore, the developed glass reported herein has high potential as a new low-carbon cementitious binder since it can be synthesised from naturally occurring carbonate free silicate minerals.
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