Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/137167
Title: Improving the carbonation of reactive MgO cement concrete via the use of NaHCO3 and NaCl
Authors: Dung, Nguyen Tien
Unluer, Cise
Keywords: Engineering::Civil engineering
Issue Date: 2018
Source: Dung, N. T., & Unluer, C. (2018). Improving the carbonation of reactive MgO cement concrete via the use of NaHCO3 and NaCl. Journal of Materials in Civil Engineering, 30(12), 04018320-. doi:10.1061/(ASCE)MT.1943-5533.0002509
Journal: Journal of Materials in Civil Engineering
Abstract: The performance of reactive MgO cement (RMC)-based concrete formulations is determined by the carbonation process, which is hindered by the inadequate CO2 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 CO2 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 CO2 and improves the content and morphology of carbonate phases, leading to the formation of a strong carbonate network that increases sample performance by > 100% at 28 days.
URI: https://hdl.handle.net/10356/137167
ISSN: 0899-1561
DOI: 10.1061/(ASCE)MT.1943-5533.0002509
Rights: © 2018 American Society of Civil Engineers. All rights reserved. This paper was published in Journal of Materials in Civil Engineering and is made available with permission of American Society of Civil Engineers.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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