University of Oulu

Katrijn Gijbels, Hoang Nguyen, Paivo Kinnunen, Wouter Schroeyers, Yiannis Pontikes, Sonja Schreurs, Mirja Illikainen, Feasibility of incorporating phosphogypsum in ettringite-based binder from ladle slag, Journal of Cleaner Production, Volume 237, 2019, 117793, ISSN 0959-6526,

Feasibility of incorporating phosphogypsum in ettringite-based binder from ladle slag

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Author: Gijbels, Katrijn1; Nguyen, Hoang2; Kinnunen, Päivö2;
Organizations: 1Hasselt University, CMK, Nuclear Technological Centre, Agoralaan, Gebouw H, 3590 Diepenbeek, Belgium
2Fibre and Particle Engineering Research Unit, University of Oulu, Pentti Kaiteran katu 1, 90014 Oulu, Finland
3KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, 3001 Leuven, Belgium
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2019-08-08


Aiming to utilize phosphogypsum (PG) as a construction material, this study investigated the potential use of PG as a calcium sulfate source for the production of an ettringite-based binder (LSG). Six compositions with different percentages and PG’s of different origin were hydrated with ladle slag (LS) to form LSG. The hydration, mineralogy and compressive strength of all mixtures were investigated and compared with a reference LSG made of pure synthetic gypsum. The minor impurities in PG, the different particle size distribution as well as the mineralogy induced distinguishable effects on the heat of hydration, phase assemblage and morphology. The results showed that the use of side-stream PG instead of pure gypsum results in superior properties with a 60% increase in compressive strength. This investigation shows high potential to produce a completely by-product-based LSG by combining different sources of industrial side-streams with minimal chemical and energy use.

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Series: Journal of cleaner production
ISSN: 0959-6526
ISSN-E: 1879-1786
ISSN-L: 0959-6526
Volume: 237
Article number: 117793
DOI: 10.1016/j.jclepro.2019.117793
Type of Publication: A1 Journal article – refereed
Field of Science: 212 Civil and construction engineering
216 Materials engineering
Funding: This work was supported by the Fund for Scientific Research Flanders (FWO). The authors would like to acknowledge the networking support of the COST Action TU1301, At the University of Oulu, this work was done as part of the FLOW Project (project number 8904/31/2017) funded by Business Finland in the ERA-MIN 2 Innovation program (EU Horizon 2020 program).
Copyright information: © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (