Influence of CO2 concentration on the performance of MgO cement mixes

Dung, N.T., Hay, R., Lesimple, A., Celik, K. and Unluer, C. (2021) Influence of CO2 concentration on the performance of MgO cement mixes. Cement and Concrete Composites, 115, 103826. (doi: 10.1016/j.cemconcomp.2020.103826)

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This paper investigated the influence of different CO2 concentrations on the microstructural and mechanical development of reactive MgO cement (RMC) concrete. Combination of various analyses revealed the enhancement of hydrated magnesium carbonate (HMC) phases with relatively superior micro-mechanical properties as the CO2 concentration increased from ambient (~0.04%) to accelerated (5–20%) levels. The higher CO2 diffusion within samples cured under 5–20% CO2 increased the compressive strength by ~5 times. While samples cured under 20% CO2 revealed high early strengths, the formation of a dense HMC layer on the sample exterior led to limitations on further CO2 diffusion. Use of 5% CO2 produced comparable strengths as 20% CO2 at 28 days, highlighting the potential of using lower concentrations. Samples cured under 10% CO2 revealed the best performance at 28 days, thereby defining this environment as the most favorable condition for the development of microstructural and mechanical properties of RMC concrete.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Unluer, Dr Cise
Authors: Dung, N.T., Hay, R., Lesimple, A., Celik, K., and Unluer, C.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Cement and Concrete Composites
ISSN (Online):1873-393X
Published Online:25 September 2020
Copyright Holders:Copyright © 2020 Elsevier
First Published:First published in Cement and Concrete Composites 115:103826
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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