Improving the Carbonation of Reactive MgO Cement Concrete via the Use of and NaCl
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 12
Abstract
The performance of reactive MgO cement (RMC)-based concrete formulations is determined by the carbonation process, which is hindered by the inadequate dissolution in the pore solution. This study addresses the improvement of carbonation and associated performance of carbonated RMC-based concrete samples via the introduction of sodium bicarbonate (SBC) and sodium chloride (SC). The use of these additives increases the initial pH, which accelerates the dissolution of within the pore solution. The influence of SBC and SC on the progress of hydration is evaluated by isothermal calorimetry and pH measurements. Mechanical performance results are supported by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM), which identify the formation and morphology of final phases. The presence of SBC and SC enhances the dissolution of and improves the content and morphology of carbonate phases, leading to the formation of a strong carbonate network that increases sample performance by at 28 days.
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Acknowledgments
The authors acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 1 (RG 95/16) for the completion of this research project.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 10, 2017
Accepted: May 22, 2018
Published online: Sep 27, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 27, 2019
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