A new bacteria-based self-healing system triggered by sulfate ion for cementitious material

Su, Y; Qu, F; Zhang, J; Zhang, X

A new bacteria-based self-healing system triggered by sulfate ion for cementitious material

Su, Y Qu, F Zhang, J Zhang, X

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Journal of Building Engineering, 2024, 86, pp. 108886
Issue Date:: 2024-06-01

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Field	Value	Language
dc.contributor.author	Su, Y
dc.contributor.author	Qu, F
dc.contributor.author	Zhang, J
dc.contributor.author	Zhang, X
dc.date.accessioned	2025-03-19T22:10:10Z
dc.date.available	2025-03-19T22:10:10Z
dc.date.issued	2024-06-01
dc.identifier.citation	Journal of Building Engineering, 2024, 86, pp. 108886
dc.identifier.issn	2352-7102
dc.identifier.issn	2352-7102
dc.identifier.uri	http://hdl.handle.net/10453/185995
dc.description.abstract	Concrete in complex environments is prone to cracking due to its own brittle and porous characteristics. When environmental sulfate ions intrude into concrete, the formation of gypsum and ettringite can lead to unrestricted expansion and subsequent cracking of the concrete, so a self-healing system that responds to environmental ions is necessary. In this study, barium-doped calcium alginate gels that could be triggered by sulfate ions were used to encapsulate microbial-based repairing agents. Experimental results showed that Bacillus spores of up to 40% mass were encapsulated in a modified alginate hydrogel, which had good compatibility with bacteria and concrete. Meanwhile, the sensitivity of microcapsules to sulfate at different concentrations was also verified. The new self-healing system introduces two response modes, namely sulfate triggering and mechanical stimulation, to address concrete cracks at various ages. Even for cracks that emerge 60 days later, the crack healing ratio can still reach 80%. Additionally, the new system can provide organic-inorganic composite repairing products to maintain the stability of the repaired structures at the crack site. The repair system demonstrates good uniformity and compatibility, and the negative impact on mechanical performance can be alleviated by reducing particle size. To conclude, the new self-healing system has great potential for concrete applications in saline or marine environments.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Journal of Building Engineering
dc.relation.isbasedon	10.1016/j.jobe.2024.108886
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0905 Civil Engineering, 1201 Architecture, 1202 Building
dc.subject.classification	3302 Building
dc.subject.classification	4005 Civil engineering
dc.title	A new bacteria-based self-healing system triggered by sulfate ion for cementitious material
dc.type	Journal Article
utslib.citation.volume	86
utslib.for	0905 Civil Engineering
utslib.for	1201 Architecture
utslib.for	1202 Building
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	recently_added	*
dc.date.updated	2025-03-19T22:10:07Z
pubs.publication-status	Published
pubs.volume	86

Abstract:

Concrete in complex environments is prone to cracking due to its own brittle and porous characteristics. When environmental sulfate ions intrude into concrete, the formation of gypsum and ettringite can lead to unrestricted expansion and subsequent cracking of the concrete, so a self-healing system that responds to environmental ions is necessary. In this study, barium-doped calcium alginate gels that could be triggered by sulfate ions were used to encapsulate microbial-based repairing agents. Experimental results showed that Bacillus spores of up to 40% mass were encapsulated in a modified alginate hydrogel, which had good compatibility with bacteria and concrete. Meanwhile, the sensitivity of microcapsules to sulfate at different concentrations was also verified. The new self-healing system introduces two response modes, namely sulfate triggering and mechanical stimulation, to address concrete cracks at various ages. Even for cracks that emerge 60 days later, the crack healing ratio can still reach 80%. Additionally, the new system can provide organic-inorganic composite repairing products to maintain the stability of the repaired structures at the crack site. The repair system demonstrates good uniformity and compatibility, and the negative impact on mechanical performance can be alleviated by reducing particle size. To conclude, the new self-healing system has great potential for concrete applications in saline or marine environments.

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http://hdl.handle.net/10453/185995