Xiao, X., Goh, L. X., Unluer, C. and Yang, E.-H. (2021) Bacteria-induced internal carbonation of reactive magnesia cement. Construction and Building Materials, 267, 121748. (doi: 10.1016/j.conbuildmat.2020.121748)
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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.
| Item Type: | Articles |
|---|---|
| Additional Information: | The authors acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 2 (MOE2017-T2-1-087(S)). |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Unluer, Dr Cise |
| Creator Roles: | |
| Authors: | Xiao, X., Goh, L. X., Unluer, C., and Yang, E.-H. |
| College/School: | College of Science and Engineering > School of Engineering > Infrastructure and Environment |
| Journal Name: | Construction and Building Materials |
| Publisher: | Elsevier |
| ISSN: | 0950-0618 |
| ISSN (Online): | 1879-0526 |
| Published Online: | 07 December 2020 |
| Copyright Holders: | Copyright © 2020 Elsevier |
| First Published: | First published in Construction and Building Materials 267:121748 |
| Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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