Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/30747
Title: Regulating hydration and microstructure development of reactive MgO cement by citric acids
Authors: Wang, H
Liang, S
Zhou, X
Hou, P
Cheng, X
Keywords: reactive MgO cement;citric acid;hydration;carbonation;carbon curing
Issue Date: 1-Nov-2024
Publisher: Elsevier
Citation: Wang, H. et al. (2025) 'Regulating hydration and microstructure development of reactive MgO cement by citric acids', Cement and Concrete Composites, 155, 105832, pp. 1 - 17. doi: 10.1016/j.cemconcomp.2024.105832.
Abstract: Reactive MgO cement (RMC) is a novel binder formed through the hydration and carbonation of MgO, but its low reactivity hinders its wider application. Preliminary research has suggested that citric acids can form compounds with Mg2+ that regulate these processes, but the mechanism is yet to be understood well. This study investigated the effects of citric acids on the fresh and hardened properties of RMC. Results showed that the shear yield stress and plastic viscosity of the RMC pastes decreased with the addition of citric acids. Under standard curing, 4 wt% and 8 wt% citric acids increased the compressive strength of RMC by ∼100 % at 14 days. The adsorption of citrate on MgO inhibited the formation of brucite, forming an amorphous network-like microstructure crystallised after 14 days. Under CO2 curing, the compressive strength of RMC with 8 wt% citric acids increased by 12 % at 14 days, which could be ascribed to the porous microstructure formed that promotes the uptake of CO2 and the densification of the microstructure.
Description: Data availability: Data will be made available on request.
URI: https://bura.brunel.ac.uk/handle/2438/30747
DOI: https://doi.org/10.1016/j.cemconcomp.2024.105832
ISSN: 0958-9465
Other Identifiers: ORCiD: Huanhuan Wang https://orcid.org/0000-0001-9182-8556
ORCiD: Xiangming Zhou https://orcid.org/0000-0001-7977-0718
ORCiD: Pengkun Hou https://orcid.org/0000-0001-9182-8556
105832
Appears in Collections:Dept of Civil and Environmental Engineering Research Papers

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