Development of a functionally graded bacteria capsule for self-healing concrete

This paper reported the development of a novel functionally graded reactive magnesia cement-based bacteria spores (RMC-B) capsule for self-healing concrete. The capsule had a gradient structure with a dense shell and a porous and low alkaline core to better protect and to enhance the viability of th...

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Main Authors: Xiao, Xi, Tan, Ashley C. Y., Unluer, Cise, Yang, En-Hua
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/164653
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1646532023-02-07T07:45:56Z Development of a functionally graded bacteria capsule for self-healing concrete Xiao, Xi Tan, Ashley C. Y. Unluer, Cise Yang, En-Hua School of Civil and Environmental Engineering Engineering::Civil engineering Bacteria Capsules This paper reported the development of a novel functionally graded reactive magnesia cement-based bacteria spores (RMC-B) capsule for self-healing concrete. The capsule had a gradient structure with a dense shell and a porous and low alkaline core to better protect and to enhance the viability of the bacteria spores. With the addition of the capsule, the strength of the matrix can be maintained while engaging self-healing of cracks. Results showed that the inclusion of the RMC-B capsules did not negatively impact the hydration and the fresh properties of the PC paste and enhanced the 28-day compressive strength of the hardened PC paste by 18%. Specimens with the RMC-B capsules exhibited strong crack healing performance as evidenced by the closure of cracks of few hundred microns and reduction of transport properties due to the dense formation of layered rhombohedral calcite along the entire crack from the surface to the interior. Ministry of Education (MOE) The authors acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 2 (MOE2017-T2-1-087 (S)) . 2023-02-07T07:45:56Z 2023-02-07T07:45:56Z 2023 Journal Article Xiao, X., Tan, A. C. Y., Unluer, C. & Yang, E. (2023). Development of a functionally graded bacteria capsule for self-healing concrete. Cement and Concrete Composites, 136, 104863-. https://dx.doi.org/10.1016/j.cemconcomp.2022.104863 0958-9465 https://hdl.handle.net/10356/164653 10.1016/j.cemconcomp.2022.104863 2-s2.0-85143357501 136 104863 en MOE2017-T2-1-087 (S) Cement and Concrete Composites © 2022 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Bacteria
Capsules
spellingShingle Engineering::Civil engineering
Bacteria
Capsules
Xiao, Xi
Tan, Ashley C. Y.
Unluer, Cise
Yang, En-Hua
Development of a functionally graded bacteria capsule for self-healing concrete
description This paper reported the development of a novel functionally graded reactive magnesia cement-based bacteria spores (RMC-B) capsule for self-healing concrete. The capsule had a gradient structure with a dense shell and a porous and low alkaline core to better protect and to enhance the viability of the bacteria spores. With the addition of the capsule, the strength of the matrix can be maintained while engaging self-healing of cracks. Results showed that the inclusion of the RMC-B capsules did not negatively impact the hydration and the fresh properties of the PC paste and enhanced the 28-day compressive strength of the hardened PC paste by 18%. Specimens with the RMC-B capsules exhibited strong crack healing performance as evidenced by the closure of cracks of few hundred microns and reduction of transport properties due to the dense formation of layered rhombohedral calcite along the entire crack from the surface to the interior.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Xiao, Xi
Tan, Ashley C. Y.
Unluer, Cise
Yang, En-Hua
format Article
author Xiao, Xi
Tan, Ashley C. Y.
Unluer, Cise
Yang, En-Hua
author_sort Xiao, Xi
title Development of a functionally graded bacteria capsule for self-healing concrete
title_short Development of a functionally graded bacteria capsule for self-healing concrete
title_full Development of a functionally graded bacteria capsule for self-healing concrete
title_fullStr Development of a functionally graded bacteria capsule for self-healing concrete
title_full_unstemmed Development of a functionally graded bacteria capsule for self-healing concrete
title_sort development of a functionally graded bacteria capsule for self-healing concrete
publishDate 2023
url https://hdl.handle.net/10356/164653
_version_ 1759058764837683200