Cracking of limestone calcined clay blended concrete and mortar under restrained shrinkage

Afroz, S; Nguyen, QD; Zhang, Y; Kim, T; Castel, A

Cracking of limestone calcined clay blended concrete and mortar under restrained shrinkage

Afroz, S Nguyen, QD Zhang, Y Kim, T Castel, A

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2023, 386
Issue Date:: 2023-07-10

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Field	Value	Language
dc.contributor.author	Afroz, S
dc.contributor.author	Nguyen, QD
dc.contributor.author	Zhang, Y
dc.contributor.author	Kim, T
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.date.accessioned	2024-04-10T05:39:19Z
dc.date.available	2024-04-10T05:39:19Z
dc.date.issued	2023-07-10
dc.identifier.citation	Construction and Building Materials, 2023, 386
dc.identifier.issn	0950-0618
dc.identifier.issn	1879-0526
dc.identifier.uri	http://hdl.handle.net/10453/177645
dc.description.abstract	This work is investigating restrained shrinkage induced early age cracking of limestone calcined clay (LC) blended concrete and mortar. A series of ring tests was conducted on LC blended concretes with 44% replacement of General Purpose (GP) cement and reference GP cement-only concretes. In addition, autogenous shrinkage and total shrinkage of concretes, mortars, and pastes were monitored to investigate the effect of the addition of LC on the different shrinkages and subsequent restrained shrinkage induced cracking. Results showed that LC blended concrete cracked earlier than the control mixes due to a high stress rate which is a function of the shrinkage of the restrained concrete ring. However, the autogenous shrinkage of concrete, rather than the total shrinkage, significantly influenced the early age cracking of LC blends. The ratio (total/autogenous) of shrinkage rates was proportional to the time to cracking for all mixes. The dependency of cracking on early-age autogenous shrinkage was further corroborated by the ring test results using LC blended mortar mixes considering various replacement levels ranging from 14% to 59%. Less early-age autogenous shrinkage in the LC blend with 59% replacement contributed to delayed cracking compared to other mortar mixes.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation	http://purl.org/au-research/grants/arc/LP170100912
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2023.131599
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.subject.classification	3302 Building
dc.subject.classification	4005 Civil engineering
dc.subject.classification	4016 Materials engineering
dc.title	Cracking of limestone calcined clay blended concrete and mortar under restrained shrinkage
dc.type	Journal Article
utslib.citation.volume	386
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	open_access	*
dc.date.updated	2024-04-10T05:39:18Z
pubs.publication-status	Published
pubs.volume	386

Abstract:

This work is investigating restrained shrinkage induced early age cracking of limestone calcined clay (LC) blended concrete and mortar. A series of ring tests was conducted on LC blended concretes with 44% replacement of General Purpose (GP) cement and reference GP cement-only concretes. In addition, autogenous shrinkage and total shrinkage of concretes, mortars, and pastes were monitored to investigate the effect of the addition of LC on the different shrinkages and subsequent restrained shrinkage induced cracking. Results showed that LC blended concrete cracked earlier than the control mixes due to a high stress rate which is a function of the shrinkage of the restrained concrete ring. However, the autogenous shrinkage of concrete, rather than the total shrinkage, significantly influenced the early age cracking of LC blends. The ratio (total/autogenous) of shrinkage rates was proportional to the time to cracking for all mixes. The dependency of cracking on early-age autogenous shrinkage was further corroborated by the ring test results using LC blended mortar mixes considering various replacement levels ranging from 14% to 59%. Less early-age autogenous shrinkage in the LC blend with 59% replacement contributed to delayed cracking compared to other mortar mixes.

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http://hdl.handle.net/10453/177645