Carbon Dioxide–Activated Steel Slag for Slag-Bonded Wallboard Application
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 3
Abstract
The feasibility of making slag-bonded construction wallboard through carbon dioxide activation of steel slag was investigated. The steel slag used in the study is a by-product of the Klockner Oxygen Blown Maxhutte (KOBM) steel-making process. The -activated steel slag can potentially be used as a cementing material in place of ordinary portland cement (OPC). The 2-h carbonation strength of the activated steel slag reached 46 MPa and the 28-day strength after carbonation and hydration was more than 60 MPa. Carbonation of steel slag enabled utilization up to 6.8% on a dry-slag-mass basis. The high early strength obtained in -activated slag is attributed to the rapid formation of calcium-silicate-hydrates and calcium carbonates. The precipitation of rhombohedral nanoparticles significantly enhances packing density and reduces the porosity of the carbonate matrix. A slag-bonded wallboard using sawdust as lightweight filler was successfully fabricated and its mechanical performance was comparable to cement-based commercial products.
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Acknowledgments
The financial supports from the Fonds québécois de la recherche sur la nature et les technologies (FQRNT) of Quebec and the National Science Foundation of China (No. 51379163) are acknowledged. The authors are also grateful to Quebec Rio Tinto Iron & Titanium (RTFT) for the KOBM steel slag samples.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 3 • March 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jun 11, 2013
Accepted: Feb 6, 2014
Published online: Jul 14, 2014
Discussion open until: Dec 14, 2014
Published in print: Mar 1, 2015
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