Evaluating the impact of curing temperature in delayed ettringite formation using electrochemical impedance spectroscopy

Ramu, YK; Sirivivatnanon, V; Thomas, P; Dhandapani, Y; Vessalas, K

Evaluating the impact of curing temperature in delayed ettringite formation using electrochemical impedance spectroscopy

Ramu, YK Sirivivatnanon, V

Thomas, P

Dhandapani, Y Vessalas, K

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2021, 282
Issue Date:: 2021-05-03

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Field	Value	Language
dc.contributor.author	Ramu, YK
dc.contributor.author	Sirivivatnanon, V https://orcid.org/0000-0003-1901-6064
dc.contributor.author	Thomas, P https://orcid.org/0000-0001-6962-2121
dc.contributor.author	Dhandapani, Y
dc.contributor.author	Vessalas, K https://orcid.org/0000-0003-3948-5212
dc.date.accessioned	2022-01-31T23:17:17Z
dc.date.available	2022-01-31T23:17:17Z
dc.date.issued	2021-05-03
dc.identifier.citation	Construction and Building Materials, 2021, 282
dc.identifier.issn	0950-0618
dc.identifier.issn	1879-0526
dc.identifier.uri	http://hdl.handle.net/10453/154010
dc.description.abstract	Delayed ettringite formation (DEF) could be deleterious and reduce the serviceability of structures built with precast concrete elements subjected to a short-term heat curing regime. Over 3 decades of research many characterization techniques have been developed to study the impact of DEF in cementitious systems. This paper attempts to assess the physical alterations due to DEF in cementitious systems using electrochemical impedance spectroscopy (EIS). Mortar specimens were made with two different cements exposed to different curing regimes and prone to DEF attack. At later age of 500 days after the significant expansion due to DEF, impedance arcs of mortar specimens were collected. Electrical resistivities owing to continuously connected pores and discontinuously connected pores were calculated with the impedance values. Electrical resistivities were compared with linear expansion and mass change of mortars. Results show a significant reduction in impedance with an increase in curing temperature due to physical damage and electrical resistivity was lowest for mortars with high DEF expansion. Precipitation of heterogenous DEF in confined microstructure capable of generating expansion further contributes to the lowering the electrical resistivity. This research shows EIS can be used to monitor the physical damage in the microstructure of the cementitious system to study deterioration mechanisms such as DEF.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2021.122726
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Evaluating the impact of curing temperature in delayed ettringite formation using electrochemical impedance spectroscopy
dc.type	Journal Article
utslib.citation.volume	282
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	*
dc.date.updated	2022-01-31T23:17:14Z
pubs.publication-status	Published
pubs.volume	282

Abstract:

Delayed ettringite formation (DEF) could be deleterious and reduce the serviceability of structures built with precast concrete elements subjected to a short-term heat curing regime. Over 3 decades of research many characterization techniques have been developed to study the impact of DEF in cementitious systems. This paper attempts to assess the physical alterations due to DEF in cementitious systems using electrochemical impedance spectroscopy (EIS). Mortar specimens were made with two different cements exposed to different curing regimes and prone to DEF attack. At later age of 500 days after the significant expansion due to DEF, impedance arcs of mortar specimens were collected. Electrical resistivities owing to continuously connected pores and discontinuously connected pores were calculated with the impedance values. Electrical resistivities were compared with linear expansion and mass change of mortars. Results show a significant reduction in impedance with an increase in curing temperature due to physical damage and electrical resistivity was lowest for mortars with high DEF expansion. Precipitation of heterogenous DEF in confined microstructure capable of generating expansion further contributes to the lowering the electrical resistivity. This research shows EIS can be used to monitor the physical damage in the microstructure of the cementitious system to study deterioration mechanisms such as DEF.

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http://hdl.handle.net/10453/154010