University of Oulu

Sreenivasan, H., Adesanya, E., Niu, H., Perumal, P., Kantola, A. M., Telkki, V.-V., Huttula, M., Cao, W., Provis, J. L., Illikainen, M., & Kinnunen, P. (2021). Evidence of formation of an amorphous magnesium silicate (AMS) phase during alkali activation of (Na-Mg) aluminosilicate glasses. Cement and Concrete Research, 145, 106464. https://doi.org/10.1016/j.cemconres.2021.106464

Evidence of formation of an amorphous magnesium silicate (AMS) phase during alkali activation of (Na-Mg) aluminosilicate glasses

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Author: Sreenivasan, Harisankar1; Adesanya, Elijah1; Niu, He1;
Organizations: 1Fibre and Particle Engineering Research Unit, P.O. Box 4300, FI-90014, University of Oulu, Finland
2NMR Research Unit, Faculty of Science, P.O. Box 3000, FI-90014, University of Oulu, Finland
3Nano and Molecular Systems Research Unit, P.O. Box 3000, FI-90014, University of Oulu, Finland
4Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Sheffield S1 3JD, United Kingdom
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.1 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021050528883
Language: English
Published: Elsevier, 2021
Publish Date: 2021-05-05
Description:

Abstract

There is some ambiguity regarding the fate of Mg during the alkali activation of Mg-rich precursors within the broader field of alkali activated materials (AAMs). The present work addresses this issue by studying the reaction products in AAMs synthesized from (Na-Mg) aluminosilicate glasses. Here, instead of magnesium silicate hydrate (M-S-H) phase, Mg exclusively forms an amorphous magnesium silicate (AMS) phase. Compared to M-S-H, AMS is a more depolymerized phase, which has not previously been well documented. The formation of AMS seems to be driven by the high charge density of the Mg cation which effectively stabilizes the depolymerized silicate species. We also show that the lack of hydrotalcite-group phases is due to aluminum depletion by zeolite formation. This work highlights the need to consider the existence of the AMS phase in Mg-containing AAMs, especially in complex systems, where its identification may be difficult.

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Series: Cement and concrete research
ISSN: 0008-8846
ISSN-E: 1873-3948
ISSN-L: 0008-8846
Volume: 145
Article number: 106464
DOI: 10.1016/j.cemconres.2021.106464
OADOI: https://oadoi.org/10.1016/j.cemconres.2021.106464
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
116 Chemical sciences
Subjects:
Funding: The authors gratefully acknowledge the financial support received from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie COFUND Grant Agreement no. 713606 (I4FUTURE). P.K. acknowledges financial support from Kvantum institute (University of Oulu) and Academy of Finland (grants 322085, 329477 and 326291). A.M.K and V.-V.T. acknowledge the financial support from Kvantum institute (University of Oulu) and Academy of Finland (grants #289649 and 319216).
EU Grant Number: (713606) I4FUTURE - Novel Imaging and Characterisation Methods in Bio, Medical, and Environmental Research and Technology Innovations
Academy of Finland Grant Number: 322085
329477
326291
289649
319216
Detailed Information: 322085 (Academy of Finland Funding decision)
329477 (Academy of Finland Funding decision)
326291 (Academy of Finland Funding decision)
289649 (Academy of Finland Funding decision)
319216 (Academy of Finland Funding decision)
Copyright information: © 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
  https://creativecommons.org/licenses/by/4.0/