Damage of non-steam-cured UHPC under axial compression with and without short-term sustained loading history

Zhang, Z; Xu, T; Castel, A

Damage of non-steam-cured UHPC under axial compression with and without short-term sustained loading history

Zhang, Z Xu, T Castel, A

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Structures, 2022, 38, pp. 1066-1078
Issue Date:: 2022-04-01

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Field	Value	Language
dc.contributor.author	Zhang, Z
dc.contributor.author	Xu, T
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.date.accessioned	2023-01-31T03:10:05Z
dc.date.available	2023-01-31T03:10:05Z
dc.date.issued	2022-04-01
dc.identifier.citation	Structures, 2022, 38, pp. 1066-1078
dc.identifier.issn	2352-0124
dc.identifier.issn	2352-0124
dc.identifier.uri	http://hdl.handle.net/10453/165661
dc.description.abstract	The damage of non-steam-cured ultra-high performance concrete (UHPC) under short-term sustained compression was experimentally investigated. The UHPC specimens were tested under monotonic loading, cyclic loading without a sustained loading history, or cyclic loading with a sustained loading history. The influence of the sustained stress levels and loading age of UHPC was elucidated. The stress-strain history of the specimens was measured. The effect of damage due to the short-term sustained loading history on the mechanical properties of UHPC was analyzed. The fraction of the sustained strains contributing to the damage was calibrated. The micro-cracking propagation within the UHPC is imagined based on non-destructive testing using an ultrasonic wave method and by assessing the nominal Poisson's ratio. The interface between steel fibers and matrix was observed by Scanning Electron Microscope (SEM). The damage occurred for the UHPC specimens under short-term sustained compression when the sustained stress was higher than 0.7fc′. Both the compressive strength and the elastic modulus of the specimens were reduced. When the sustained stress was greater than or equal to 0.8fc′, the elastic modulus of the UHPC specimens measured during the reloading phase was considerably reduced. The specimen group subjected to a sustained stress of 0.9fc′ with a duration of 128 s experienced a reduction of about 30% in elastic modulus. The damage is statistically independent of the loading age of the UHPC. Damage is characterized by micro-cracking propagation within the UHPC specimens. Microstructural analysis of the interface between steel fibers and matrix shows that under high sustained stress, the bond between the steel fibers and the concrete matrix was impaired by the creep effect and could not prevent the propagation of micro-cracks.
dc.language	en
dc.publisher	Elsevier BV
dc.relation	http://purl.org/au-research/grants/arc/LP170100912
dc.relation.ispartof	Structures
dc.relation.isbasedon	10.1016/j.istruc.2022.02.055
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.title	Damage of non-steam-cured UHPC under axial compression with and without short-term sustained loading history
dc.type	Journal Article
utslib.citation.volume	38
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	closed_access	*
dc.date.updated	2023-01-31T03:10:03Z
pubs.publication-status	Published
pubs.volume	38

Abstract:

The damage of non-steam-cured ultra-high performance concrete (UHPC) under short-term sustained compression was experimentally investigated. The UHPC specimens were tested under monotonic loading, cyclic loading without a sustained loading history, or cyclic loading with a sustained loading history. The influence of the sustained stress levels and loading age of UHPC was elucidated. The stress-strain history of the specimens was measured. The effect of damage due to the short-term sustained loading history on the mechanical properties of UHPC was analyzed. The fraction of the sustained strains contributing to the damage was calibrated. The micro-cracking propagation within the UHPC is imagined based on non-destructive testing using an ultrasonic wave method and by assessing the nominal Poisson's ratio. The interface between steel fibers and matrix was observed by Scanning Electron Microscope (SEM). The damage occurred for the UHPC specimens under short-term sustained compression when the sustained stress was higher than 0.7fc′. Both the compressive strength and the elastic modulus of the specimens were reduced. When the sustained stress was greater than or equal to 0.8fc′, the elastic modulus of the UHPC specimens measured during the reloading phase was considerably reduced. The specimen group subjected to a sustained stress of 0.9fc′ with a duration of 128 s experienced a reduction of about 30% in elastic modulus. The damage is statistically independent of the loading age of the UHPC. Damage is characterized by micro-cracking propagation within the UHPC specimens. Microstructural analysis of the interface between steel fibers and matrix shows that under high sustained stress, the bond between the steel fibers and the concrete matrix was impaired by the creep effect and could not prevent the propagation of micro-cracks.

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http://hdl.handle.net/10453/165661