Mechanical strength and self-sensing capacity of smart cementitious composite containing conductive rubber crumbs

Dong, W; Li, W; Wang, K; Vessalas, K; Zhang, S

Mechanical strength and self-sensing capacity of smart cementitious composite containing conductive rubber crumbs

Dong, W Li, W

Wang, K Vessalas, K

Zhang, S

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Publisher:: SAGE PUBLICATIONS LTD
Publication Type:: Journal Article
Citation:: Journal of Intelligent Material Systems and Structures, 2020, 31, (10), pp. 1325-1340
Issue Date:: 2020-06-01

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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	Wang, K
dc.contributor.author	Vessalas, K https://orcid.org/0000-0003-3948-5212
dc.contributor.author	Zhang, S
dc.date.accessioned	2021-02-28T22:30:55Z
dc.date.available	2021-02-28T22:30:55Z
dc.date.issued	2020-06-01
dc.identifier.citation	Journal of Intelligent Material Systems and Structures, 2020, 31, (10), pp. 1325-1340
dc.identifier.issn	1045-389X
dc.identifier.issn	1530-8138
dc.identifier.uri	http://hdl.handle.net/10453/146534
dc.description.abstract	© The Author(s) 2020. The effects of conductive rubber crumbs on the mechanical properties and self-sensing capacities of cementitious composites are investigated in this study. The rubberized cementitious composites with five different contents of conductive rubber crumbs are incorporated, ranging from 0%, 10%, 20%, 30% and 40% by mass of fine aggregate. Under the uniaxial cyclic compression, all the conductive rubber crumbs–filled cement composites exhibit excellent repeatability of piezoresistivity. The mortar with 20% conductive rubber crumbs at a water-to-binder ratio of 0.42 displayed the best piezoresistive sensitivity. Based on the relative positions of conductive rubber crumbs in the rubberized cement mortar, three conductive mechanisms were proposed for the conductive rubber crumbs, including complete isolation state, neighbouring state and the contact state. The isolation state plays a dominant role when the content of the conductive rubber crumbs is low, in which the piezoresistive behaviour is mainly controlled by the resistivity changes in cement matrix. In the neighbouring state, pores or voids in the gaps between nearby conductive rubber crumbs make the conductive rubber crumbs easier to connect, thus decreasing the resistivity under uniaxial compression. As for the contact state, the decreased contact resistance and the absence of sand between conductive rubber crumbs lead to higher resistivity changes under cyclic compression. The related results indicate that conductive rubber crumbs in cement mortar have application potentials for structural health monitoring.
dc.language	English
dc.publisher	SAGE PUBLICATIONS LTD
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation.ispartof	Journal of Intelligent Material Systems and Structures
dc.relation.isbasedon	10.1177/1045389X20916788
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	09 Engineering
dc.subject.classification	Materials
dc.title	Mechanical strength and self-sensing capacity of smart cementitious composite containing conductive rubber crumbs
dc.type	Journal Article
utslib.citation.volume	31
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
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
utslib.copyright.status	closed_access	*
dc.date.updated	2021-02-28T22:30:51Z
pubs.issue	10
pubs.publication-status	Published
pubs.volume	31
utslib.citation.issue	10

Abstract:

© The Author(s) 2020. The effects of conductive rubber crumbs on the mechanical properties and self-sensing capacities of cementitious composites are investigated in this study. The rubberized cementitious composites with five different contents of conductive rubber crumbs are incorporated, ranging from 0%, 10%, 20%, 30% and 40% by mass of fine aggregate. Under the uniaxial cyclic compression, all the conductive rubber crumbs–filled cement composites exhibit excellent repeatability of piezoresistivity. The mortar with 20% conductive rubber crumbs at a water-to-binder ratio of 0.42 displayed the best piezoresistive sensitivity. Based on the relative positions of conductive rubber crumbs in the rubberized cement mortar, three conductive mechanisms were proposed for the conductive rubber crumbs, including complete isolation state, neighbouring state and the contact state. The isolation state plays a dominant role when the content of the conductive rubber crumbs is low, in which the piezoresistive behaviour is mainly controlled by the resistivity changes in cement matrix. In the neighbouring state, pores or voids in the gaps between nearby conductive rubber crumbs make the conductive rubber crumbs easier to connect, thus decreasing the resistivity under uniaxial compression. As for the contact state, the decreased contact resistance and the absence of sand between conductive rubber crumbs lead to higher resistivity changes under cyclic compression. The related results indicate that conductive rubber crumbs in cement mortar have application potentials for structural health monitoring.

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http://hdl.handle.net/10453/146534