University of Oulu

Patrick N. Lemougna, Adeolu Adediran, Juho Yliniemi, Arnold Ismailov, Erkki Levanen, Pekka Tanskanen, Paivo Kinnunen, Juha Roning, Mirja Illikainen, Thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings and glass wool, Cement and Concrete Composites, Volume 114, 2020, 103792, ISSN 0958-9465,

Thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings and glass wool

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Author: Lemougna, Patrick N.1; Adediran, Adeolu1; Yliniemi, Juho1;
Organizations: 1Faculty of Technology, Fibre and Particle Engineering Research Unit, University of Oulu, PO Box 4300, 90014, Finland
2Materials Science and Environmental Engineering, Faculty of Engineering and Natural Sciences, Tampere University, P.O. Box 599, FI33101, Tampere, Finland
3Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, 90014, Oulu, Finland
4InfoTech Oulu, Faculty of Information Technology and Electrical Engineering, Biomimetics and Intelligent Systems Group (BISG), University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 13 MB)
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Language: English
Published: Elsevier, 2020
Publish Date: 2020-11-12


This paper deals with the synthesis and thermal stability of one-part metakaolin geopolymer composites containing high volume of spodumene tailings (Quartz Feldspar Sand; QFS) and glass wool (GW). One of the objectives of the study was to prepare materials encompassing a maximum amount of waste streams with some potential thermal stability. Several compositions were prepared with sodium metasilicate anhydrous (Na2SiO3) wt.% of 0.5, 2.5, 5, 10 and 12,5. The one-part metakaolin geopolymer composites were cured at 60 °C for 24 h and the mechanical properties were assessed at 7 days and after post-heat treatment at 500, 750, 1000, 1100 or 1200 °C. X-ray diffraction, dilatometry, scanning electron microscopy and thermogravimetry analyses were used to study the stability of the prepared geopolymer composites until 1100–1200 °C. The results showed that more than 20 MPa compressive strength could be achieved with metakaolin geopolymer composites containing only 20 wt% of metakaolin. Metakaolin-GW geopolymer composites were stable up to 500 °C. Meanwhile, their counterparts containing QFS were stable up to 1100–1200 °C; samples prepared with higher dosage of sodium (Na2SiO3 > 5 wt%) retained more than 50% of their initial strength after thermal treatment at 1100 °C. Interestingly, for dosages of Na2SiO3 ≤ 5 wt%, more than 300% increase of strength was observed after thermal treatment at 1100–1200 °C. The use of QFS limited the thermal shrinkage at mild temperatures (<1000 °C), but favoured densification and strength development at 1100–1200 °C.

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Series: Cement & concrete composites
ISSN: 0958-9465
ISSN-E: 1873-393X
ISSN-L: 0958-9465
Volume: 114
Article number: 103792
DOI: 10.1016/j.cemconcomp.2020.103792
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This work was performed under the framework of the “GEOBOT” project, supported by the European Regional Development Fund (ERDF), Pohjois-Pohjanmaa Council of Oulu Region and Vipuvoimaa EU:lta 2014–2020 and companies Boliden Harjavalta Oy, Keliber Oy and Saint-Gobain Finland Oy. The authors acknowledge financial support from Academy of Finland from grant 322786 (JY), as well as from grants 322085, 329477 and 326291 (PK). A.A. has received funding from K.H Renlund foundation towards his doctoral research. Part of the work was carried out with the support of the Centre for Material Analysis, University of Oulu, Finland.
Academy of Finland Grant Number: 322786
Detailed Information: 322786 (Academy of Finland Funding decision)
322085 (Academy of Finland Funding decision)
329477 (Academy of Finland Funding decision)
Copyright information: © 2020 The Authors. Published by Elsevier Ltd. his is an open access article under the CC BY-NC-ND license (