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Title: Bacteria-induced internal carbonation of reactive magnesia cement
Authors: Xiao, Xi
Goh, Li Xuan
Unluer, Cise
Yang, En-Hua
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: Xiao, X., Goh, L. X., Unluer, C. & Yang, E. (2021). Bacteria-induced internal carbonation of reactive magnesia cement. Construction and Building Materials, 267, 121748-.
Project: MOE2017-T2-1-087
Journal: Construction and Building Materials
Abstract: With lower calcination temperature, reactive magnesia cement (RMC) can be a potential alternative to the Portland cement. However, RMC concrete requires accelerated carbonation curing from external sources which greatly hinder the wider applications of RMC. This study proposed a bacteria-based method for the strength gain of RMC through internal carbonation. Sporosarcina pasteurii, urea, and yeast extract were used as a carbonation agent for internal carbonation of RMC pastes. Results showed that the flowability of the fresh bio-RMC paste increased by 20% while the initial setting time remained unchanged. Besides serving as the CO2 provider, urea can also function as superplasticizer to reduce the water demand of the bio-RMC pastes. The resulting bio-RMC pastes showed a continuous strength gain with time, demonstrating the feasibility of bacteria-induced internal carbonation of RMC. Microstructure analysis revealed abundant formation of hydrated magnesium carbonates in the bio-RMC pastes, which is responsible for the strength gain of the bio-RMC pastes.
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2020.121748
Rights: © 2020 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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