University of Oulu

P. Kinnunen, H. Sreenivasan, C.R. Cheeseman, M. Illikainen, Phase separation in alumina-rich glasses to increase glass reactivity for low-CO2 alkali-activated cements, Journal of Cleaner Production, Volume 213, 2019, Pages 126-133, ISSN 0959-6526, https://doi.org/10.1016/j.jclepro.2018.12.123

Phase separation in alumina-rich glasses to increase glass reactivity for low-CO₂ alkali-activated cements

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Author: Kinnunen, P.1,2; Sreenivasan, H.1; Cheeseman, C.R.2;
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, Finland
2Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2BU, United Kingdom
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201901071458
Language: English
Published: Elsevier, 2019
Publish Date: 2020-12-17
Description:

Abstract

Ways to reduce cement-related carbon emissions are actively sought. One possible solution is partial substitution of Portland cement by alkali-reactive glass. We report on low-CO2 glass compositions that have high alkali solubility derived from industrial basaltic stone wool compositions. We found that highly alkali-soluble glasses can be formed with glass compositions that in principle can be made using silicate minerals which have no raw material-related CO2 emissions. The reason behind the reactivity of these glasses is thought to be caused by the dilution of the main network-forming species, silicon, which is further enhanced by phase separation, forming phases with high-silicon and low-silicon concentrations. Phase separation in alumina-rich samples is further studied and occurs at moderate cooling rates. The effect of glass-glass phase separation is discussed in the context of reactive glasses in cementitious systems. The results indicate that controlled phase separation could decouple CO2 emissions from the reactivity of glassy supplementary cementitious materials.

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Series: Journal of cleaner production
ISSN: 0959-6526
ISSN-E: 1879-1786
ISSN-L: 0959-6526
Volume: 213
Pages: 126 - 133
DOI: 10.1016/j.jclepro.2018.12.123
OADOI: https://oadoi.org/10.1016/j.jclepro.2018.12.123
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: This work was supported by Academy of Finland (grant #292526), and an STSM Grant from COST Action CA15102.
Academy of Finland Grant Number: 292526
Detailed Information: 292526 (Academy of Finland Funding decision)
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
  https://creativecommons.org/licenses/by-nc-nd/4.0/