Experimental investigation of triaxial strength of ultra-high performance concrete after exposure to elevated temperature

Xu, Z; Li, J; Wu, P; Wu, C

Experimental investigation of triaxial strength of ultra-high performance concrete after exposure to elevated temperature

Xu, Z Li, J

Wu, P Wu, C

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2021, 295, pp. 1-14
Issue Date:: 2021-08-09

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Field	Value	Language
dc.contributor.author	Xu, Z
dc.contributor.author	Li, J https://orcid.org/0000-0003-2457-1994
dc.contributor.author	Wu, P
dc.contributor.author	Wu, C https://orcid.org/0000-0001-6786-7934
dc.date.accessioned	2022-03-07T04:26:21Z
dc.date.available	2022-03-07T04:26:21Z
dc.date.issued	2021-08-09
dc.identifier.citation	Construction and Building Materials, 2021, 295, pp. 1-14
dc.identifier.issn	0950-0618
dc.identifier.issn	0950-0618
dc.identifier.uri	http://hdl.handle.net/10453/155017
dc.description.abstract	Equipped with excellent strength and energy absorption capacity, ultra-high performance concrete (UHPC) is a promising material to improve structural resistance against extreme loads. Material and structural tests at ambient temperature have been conducted extensively on UHPC specimens in recent years, and its mechanical properties have been well-documented. In this study, a hybrid steel and polypropylene (PP) fibre reinforced UHPC is investigated under uniaxial and triaxial compression states after exposure to elevated temperatures. Cubic (50 mm) and cylindrical specimens (50 mm diameter × 100 mm height) were first heated in electric furnace to target temperatures, i.e. 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. After naturally cooled down to ambient temperature, the specimens were tested under uniaxial compression and triaxial compression with confining pressure ranging from 5 to 40 MPa. The triaxial stress–strain relationships and failure modes after exposure to elevated temperatures were then compared and discussed. Several common failure criteria for concrete material were adopted to describe the high temperature effect on UHPC's strength. An empirical model for reproducing the triaxial compression stress–strain curves of UHPC after elevated temperature was proposed.
dc.language	English
dc.publisher	Elsevier
dc.relation	http://purl.org/au-research/grants/arc/DP210101100
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2021.123689
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Experimental investigation of triaxial strength of ultra-high performance concrete after exposure to elevated temperature
dc.type	Journal Article
utslib.citation.volume	295
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	*
pubs.consider-herdc	false
dc.date.updated	2022-03-07T04:26:19Z
pubs.publication-status	Published
pubs.volume	295

Abstract:

Equipped with excellent strength and energy absorption capacity, ultra-high performance concrete (UHPC) is a promising material to improve structural resistance against extreme loads. Material and structural tests at ambient temperature have been conducted extensively on UHPC specimens in recent years, and its mechanical properties have been well-documented. In this study, a hybrid steel and polypropylene (PP) fibre reinforced UHPC is investigated under uniaxial and triaxial compression states after exposure to elevated temperatures. Cubic (50 mm) and cylindrical specimens (50 mm diameter × 100 mm height) were first heated in electric furnace to target temperatures, i.e. 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. After naturally cooled down to ambient temperature, the specimens were tested under uniaxial compression and triaxial compression with confining pressure ranging from 5 to 40 MPa. The triaxial stress–strain relationships and failure modes after exposure to elevated temperatures were then compared and discussed. Several common failure criteria for concrete material were adopted to describe the high temperature effect on UHPC's strength. An empirical model for reproducing the triaxial compression stress–strain curves of UHPC after elevated temperature was proposed.

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http://hdl.handle.net/10453/155017