University of Oulu

Abdollahnejad, Z., Dalvand, A., Mastali, M., Luukkonen, T., Illikainen, M. (2019) Effects of waste ground glass and lime on the crystallinity and strength of geopolymers. Magazine of Concrete Research, 71 (23), 1218-1231. doi:10.1680/jmacr.18.00300

Effects of waste ground glass and lime on the crystallinity and strength of geopolymers

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Author: Abdollahnejad, Z.1; Dalvand, A.2; Mastali, M.1;
Organizations: 1Fibre and Particle Engineering, Faculty of Technology, Univ. of Oulu, P.O. Box 4300, 90014 Oulu, Finland
2Department of Engineering, Lorestan University, Khorramabad, Iran
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2019110737089
Language: English
Published: ICE Publishing, 2019
Publish Date: 2020-10-25
Description:

Abstract

This study investigates the effects of adding waste ground glass and lime on the microstructural properties of amorphous gels transitioning into crystallised zeolites in fly-ash-based geopolymers. Three different mix compositions were synthesised using fly ash, waste ground glass powder and calcium hydroxide. These mixtures were subjected to accelerated aging by thermal curing (at a temperature of 80°C), the treatment lasting for 56 d. Crystalline zeolitic phases were detected by Fourier transform infrared spectroscopy and X-ray diffraction. The results show that the transition from amorphous gels into more ordered structures readily occurred in the compositions employing only waste ground glass or calcium hydroxide, whereas a combination of waste ground glass and calcium hydroxide hindered the transition. Moreover, the topographical images of the compositions indicate a greater degree of roughness in the mixture with a lower degree of transition from the amorphous gels into more ordered structures. It was revealed that crystallisation had no harmful effect on the strength stability of the compositions cured for 28 d at a temperature of 80°C. In fact, the maximum increase in the compressive strength occurred due to the formation of crystalline zeolites in fly-ash-based geopolymers.

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Series: Magazine of concrete research
ISSN: 0024-9831
ISSN-E: 1751-763X
ISSN-L: 0024-9831
Volume: 71
Issue: 23
Pages: 1218 - 1231
DOI: 10.1680/jmacr.18.00300
OADOI: https://oadoi.org/10.1680/jmacr.18.00300
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
212 Civil and construction engineering
215 Chemical engineering
216 Materials engineering
Subjects:
Funding: The authors sincerely appreciate the collaborative efforts of the Lorestan University (Khoramabad, Iran) and Oulu University (Oulu, Finland) in implementing the study and for their financial support.
Copyright information: © ICE Publishing 2019, all rights reserved.