Piezoresistivity deterioration of smart graphene nanoplate/cement-based sensors subjected to sulphuric acid attack

Dong, W; Li, W; Vessalas, K; He, X; Sun, Z; Sheng, D

Piezoresistivity deterioration of smart graphene nanoplate/cement-based sensors subjected to sulphuric acid attack

Dong, W Li, W

Vessalas, K

He, X

Sun, Z Sheng, D

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Composites Communications, 2021, 23
Issue Date:: 2021-02-01

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Field	Value	Language
dc.contributor.author	Dong, W
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Vessalas, K https://orcid.org/0000-0003-3948-5212
dc.contributor.author	He, X https://orcid.org/0000-0001-5336-3663
dc.contributor.author	Sun, Z
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2022-05-04T12:40:05Z
dc.date.available	2022-05-04T12:40:05Z
dc.date.issued	2021-02-01
dc.identifier.citation	Composites Communications, 2021, 23
dc.identifier.issn	2452-2139
dc.identifier.uri	http://hdl.handle.net/10453/157011
dc.description.abstract	Smart cement-based sensors with self-sensing capacity have been explored for structural health monitoring (SHM) with the intrinsic piezoresistive performance. However, few studies had studied the piezoresistivity degradation of cement-based sensors after exposure to the aggressive environments, especially under sulphate acid attacks. In this study, graphene nanoplate (GNP)/cementitious composites were immersed in sulphuric acid solutions (concentrations of 0, 1%, 2%, and 3%) for 90 and 180 days. Then surface appearance, weight loss, mechanical properties, piezoresistivity and microstructure were investigated and compared before and after sulphuric acid immersion. The results show that after acid immersion, the surface deterioration and mass loss were increased, and the compressive strength was significantly decreased. As for the intact GNP/cementitious composite, the piezoresistivity exhibited excellent linearity and repeatability, demonstrating the great potential to act as intelligent cement-based sensors for SHM. After 90 and 180 days of acid immersion, the piezoresistivity was sensitive to the initial low load initially but then turned less sensitive to the later high load. The highly corroded GNP/cementitious composites exhibited porous microstructures associated with the low compressive strength. The fractional changes to resistivity (FCR) under the low load could be attributed to the compressed pores and voids filled with erosion products that would form conductive passages. In contrast, with the increase of applied load, the intact cement matrix became much denser, which in turn constrained the further development of conductive passages in the GNP/cementitious composites.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation	http://purl.org/au-research/grants/arc/IH180100010
dc.relation.ispartof	Composites Communications
dc.relation.isbasedon	10.1016/j.coco.2020.100563
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0912 Materials Engineering
dc.title	Piezoresistivity deterioration of smart graphene nanoplate/cement-based sensors subjected to sulphuric acid attack
dc.type	Journal Article
utslib.citation.volume	23
utslib.for	0912 Materials Engineering
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	*
dc.date.updated	2022-05-04T12:40:03Z
pubs.publication-status	Published
pubs.volume	23

Abstract:

Smart cement-based sensors with self-sensing capacity have been explored for structural health monitoring (SHM) with the intrinsic piezoresistive performance. However, few studies had studied the piezoresistivity degradation of cement-based sensors after exposure to the aggressive environments, especially under sulphate acid attacks. In this study, graphene nanoplate (GNP)/cementitious composites were immersed in sulphuric acid solutions (concentrations of 0, 1%, 2%, and 3%) for 90 and 180 days. Then surface appearance, weight loss, mechanical properties, piezoresistivity and microstructure were investigated and compared before and after sulphuric acid immersion. The results show that after acid immersion, the surface deterioration and mass loss were increased, and the compressive strength was significantly decreased. As for the intact GNP/cementitious composite, the piezoresistivity exhibited excellent linearity and repeatability, demonstrating the great potential to act as intelligent cement-based sensors for SHM. After 90 and 180 days of acid immersion, the piezoresistivity was sensitive to the initial low load initially but then turned less sensitive to the later high load. The highly corroded GNP/cementitious composites exhibited porous microstructures associated with the low compressive strength. The fractional changes to resistivity (FCR) under the low load could be attributed to the compressed pores and voids filled with erosion products that would form conductive passages. In contrast, with the increase of applied load, the intact cement matrix became much denser, which in turn constrained the further development of conductive passages in the GNP/cementitious composites.

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http://hdl.handle.net/10453/157011