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Title: Influence of accelerated hydration and carbonation on the performance of reactive magnesium oxide concrete
Authors: Dung, Nguyen Tien
Unluer, Cise
Keywords: Engineering::Civil engineering
Issue Date: 2020
Source: Dung, N. T. & Unluer, C. (2020). Influence of accelerated hydration and carbonation on the performance of reactive magnesium oxide concrete. Advances in Cement Research, 32(2), 78-90.
Project: RG 95/16
Journal: Advances in Cement Research
Abstract: The low dissolution of magnesium oxide (MgO) limits the performance of carbonated reactive magnesium oxide cement (RMC)-based formulations. The initial acceleration of hydration (IAH) of RMC samples involving the use of sodium bicarbonate (NaHCO3) (SBC) was enabled by way of the adjustment of curing conditions. The influence of IAH and SBC on hydration kinetics was evaluated by isothermal calorimetry, hydration degree and pH measurements. Mechanical performance results were supported by X-ray diffraction, thermogravimetric analysis and scanning electron microscopy, which identified the amount and morphology of the final phases. The use of IAH increased Mg2+ concentration and enhanced hydration and carbonation at early ages. The introduction of SBC increased CO32- concentration by providing higher initial pH and additional HCO3- that stimulated carbonation at later ages. RMC samples involving IAH and SBC outperformed others, resulting in ∼130% higher 28 d compressive strengths than the control. This increased performance was associated with improvements in the morphology and amount of carbonates, which were assessed by thermal analysis.
ISSN: 0951-7197
DOI: 10.1680/jadcr.17.00186
Schools: School of Civil and Environmental Engineering 
Rights: © 2018 Thomas Telford (ICE Publishing). All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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