Partial Replacement of Portland-Composite Cement by Fluidized Bed Combustion Fly Ash
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 8
Abstract
Fly ash from fluidized bed combustion differs greatly from that of pulverized coal firing. The most noticeable differences are in morphology, reactivity, and chemical composition. The use of biomass fly ash from fluidized bed combustion as a cement replacement material could be a promising method for both minimizing the amount of landfilled fly ash and reducing emissions in the concrete and cement industry. In this study, fly ash from fluidized bed combustion of peat and forest industry residue was used as a supplementary cementitious material for portland-composite cement (CEM II) containing clinker, blast furnace slag, and limestone. Even with a 40% cement replacement ratio, the compressive strengths of the mortar samples were still as high as 88% of the control sample’s strength. Comparison with unreactive replacement material revealed that moderate hydraulic properties of the studied fly ash explained the positive effects on strength rather than filler or nucleation effects.
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Acknowledgments
This work was done under the auspices of the MINSI project, which is supported by the European Regional Development Fund (ERDF), and various companies including Ekokem, Pohjolan Voima, Oulun Energia, SSAB, and Stora Enso. The authors would like to thank Mr. Sami Saukko (Center of Microscopy and Nanotechnology, University of Oulu) and Mr. Pekka Tanskanen (Process Metallurgy, University of Oulu) for their help and guidance related to the X-ray diffraction analysis. Mr. Jarno Karvonen and Mr. Jani Österlund are acknowledged for their contributions to the laboratory work.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Aug 24, 2016
Accepted: Nov 30, 2016
Published online: Mar 31, 2017
Published ahead of print: Apr 24, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 31, 2017
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