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Title: Degradation of carbonated reactive MgO-based concrete exposed to nitric acid
Authors: Muthu Murugan
Kumar, Sanjeev
Yang, En-Hua
Unluer, Cise
Keywords: Engineering::Civil engineering
Issue Date: 2020
Source: Muthu Murugan, Kumar, S., Yang, E. & Unluer, C. (2020). Degradation of carbonated reactive MgO-based concrete exposed to nitric acid. Journal of CO2 Utilization, 36, 210-219.
Project: MOE2017-T2-1- 087 (S)
Journal: Journal of CO2 Utilization
Abstract: MgO cement (RMC)-based mixes are known to gain strength via carbonation. While the strength gain mechanism of RMC mixes has been studied, their durability under aggressive environments is relatively unknown. This study investigated the changes in the performance and microstructure of two concrete formulations, whose binder component was made up of RMC with and without 50 % FA substitution. These concrete specimens were initially carbonated for 28 days to gain strength, followed by immersion in 0.5»M nitric acid for 14 days. The degradation of both specimens was recorded in terms of changes in their strength, mass, composition and microstructure. The use of FA led to a lower hydration and subsequent carbonation due to the lower RMC content, thereby limiting initial strength development. While the leaching of Mg-based phases into the external solution was recorded, most hydrate and carbonate phases were still present after acid exposure. The ∼56 % reduction in strength experienced by both specimens was accompanied with the formation of micro cracks.
ISSN: 2212-9820
DOI: 10.1016/j.jcou.2019.11.006
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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