Cracking and autogenous self-healing on the performance of fiber-reinforced MgO-cement composites in seawater and NaCl solutions

Xue, C

Cracking and autogenous self-healing on the performance of fiber-reinforced MgO-cement composites in seawater and NaCl solutions

Xue, C

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2022, 326, pp. 126870
Issue Date:: 2022-04-04

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Field	Value	Language
dc.contributor.author	Xue, C
dc.date.accessioned	2023-06-29T05:38:22Z
dc.date.available	2023-06-29T05:38:22Z
dc.date.issued	2022-04-04
dc.identifier.citation	Construction and Building Materials, 2022, 326, pp. 126870
dc.identifier.issn	0950-0618
dc.identifier.uri	http://hdl.handle.net/10453/171002
dc.description.abstract	MgO-cement is attracting increasing attention because of its ability to absorb CO2. In this study, the effect of cracking and autogenous self-healing on the performance of fiber-reinforced MgO-cement composites exposed to water, seawater and NaCl solutions were investigated. Moreover, changes in hydrates and microstructure as a consequence of cracking and different exposure were analyzed. It found that cracks cause significant deterioration in stiffness but 60% of the deterioration was restored by self-healing in seawater, while the load capacity was slightly affected by cracking and self-healing. Cracks in seawater were 100% self-healed by the fast precipitation of Mg(OH)2, decelerating the chloride penetration through cracks. However, the 100% crack closure achieved in NaCl solutions show no noticeable benefits for the mechanical properties and durability of cracked composites. This research provides a technical support for the use of MgO in reinforced composites to improve the sustainability of building materials.
dc.language	en
dc.publisher	Elsevier
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2022.126870
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Cracking and autogenous self-healing on the performance of fiber-reinforced MgO-cement composites in seawater and NaCl solutions
dc.type	Journal Article
utslib.citation.volume	326
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
utslib.copyright.status	closed_access	*
dc.date.updated	2023-06-29T05:38:19Z
pubs.publication-status	Published
pubs.volume	326

Abstract:

MgO-cement is attracting increasing attention because of its ability to absorb CO2. In this study, the effect of cracking and autogenous self-healing on the performance of fiber-reinforced MgO-cement composites exposed to water, seawater and NaCl solutions were investigated. Moreover, changes in hydrates and microstructure as a consequence of cracking and different exposure were analyzed. It found that cracks cause significant deterioration in stiffness but 60% of the deterioration was restored by self-healing in seawater, while the load capacity was slightly affected by cracking and self-healing. Cracks in seawater were 100% self-healed by the fast precipitation of Mg(OH)2, decelerating the chloride penetration through cracks. However, the 100% crack closure achieved in NaCl solutions show no noticeable benefits for the mechanical properties and durability of cracked composites. This research provides a technical support for the use of MgO in reinforced composites to improve the sustainability of building materials.

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http://hdl.handle.net/10453/171002