Effect of chloride ingress on self-healing recovery of smart cementitious composite incorporating crystalline admixture and MgO expansive agent

Xue, C; Li, W; Luo, Z; Wang, K; Castel, A

Effect of chloride ingress on self-healing recovery of smart cementitious composite incorporating crystalline admixture and MgO expansive agent

Xue, C Li, W

Luo, Z Wang, K Castel, A

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Cement and Concrete Research, 2021, 139, pp. 1-17
Issue Date:: 2021-01-01

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Field	Value	Language
dc.contributor.author	Xue, C
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Luo, Z
dc.contributor.author	Wang, K
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.date.accessioned	2022-04-14T03:54:23Z
dc.date.available	2022-04-14T03:54:23Z
dc.date.issued	2021-01-01
dc.identifier.citation	Cement and Concrete Research, 2021, 139, pp. 1-17
dc.identifier.issn	0008-8846
dc.identifier.issn	1873-3948
dc.identifier.uri	http://hdl.handle.net/10453/156253
dc.description.abstract	In this study, the effect of chloride environment containing various concentrations of chloride ion (Cl−) on self-healing performance of pre-cracked cementitious composite containing crystalline admixture (CA) and MgO expansive agent (MEA) was investigated under wet-dry cycles in chloride solutions. The results revealed that the Cl− changed the mineralogy of self-healing products, and consequently, affected the crack closure ratio and mechanical strength recovery. When self-healing occurred in distilled water, a large amount of ettringite (AFt) were detected, whereas in Cl− solution, monosulfate (AFm) was consumed by Cl− to form Friedel's salt (Fs), and then the Fs was decomposed to Al(OH)3(AH3) due to carbonation. During the multiphase conversion process, hydroxide (OH−) was released into crack solution, therefore the dissolved carbon dioxide (CO2) concentration was increased. The carbonation of the crystals formed in cracks was accelerated with the volume expansion, which achieved rapid crack sealing but contributed little to the mechanical performance recovery.
dc.language	English
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation.ispartof	Cement and Concrete Research
dc.relation.isbasedon	10.1016/j.cemconres.2020.106252
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Effect of chloride ingress on self-healing recovery of smart cementitious composite incorporating crystalline admixture and MgO expansive agent
dc.type	Journal Article
utslib.citation.volume	139
utslib.for	0904 Chemical Engineering
utslib.for	0905 Civil Engineering
utslib.for	1202 Building
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2022-04-14T03:54:14Z
pubs.publication-status	Published
pubs.volume	139

Abstract:

In this study, the effect of chloride environment containing various concentrations of chloride ion (Cl−) on self-healing performance of pre-cracked cementitious composite containing crystalline admixture (CA) and MgO expansive agent (MEA) was investigated under wet-dry cycles in chloride solutions. The results revealed that the Cl− changed the mineralogy of self-healing products, and consequently, affected the crack closure ratio and mechanical strength recovery. When self-healing occurred in distilled water, a large amount of ettringite (AFt) were detected, whereas in Cl− solution, monosulfate (AFm) was consumed by Cl− to form Friedel's salt (Fs), and then the Fs was decomposed to Al(OH)3(AH3) due to carbonation. During the multiphase conversion process, hydroxide (OH−) was released into crack solution, therefore the dissolved carbon dioxide (CO2) concentration was increased. The carbonation of the crystals formed in cracks was accelerated with the volume expansion, which achieved rapid crack sealing but contributed little to the mechanical performance recovery.

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http://hdl.handle.net/10453/156253