Linear and nonlinear tensile creep of steam-cured UHPC

Xu, T; Xu, Z; Liu, ZF; Zhang, Y; Castel, A; Yang, G

Linear and nonlinear tensile creep of steam-cured UHPC

Xu, T Xu, Z Liu, ZF Zhang, Y Castel, A

Yang, G

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Cement and Concrete Composites, 2024, 145
Issue Date:: 2024-01-01

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Field	Value	Language
dc.contributor.author	Xu, T
dc.contributor.author	Xu, Z
dc.contributor.author	Liu, ZF
dc.contributor.author	Zhang, Y
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.contributor.author	Yang, G
dc.date.accessioned	2025-03-17T07:25:00Z
dc.date.available	2025-03-17T07:25:00Z
dc.date.issued	2024-01-01
dc.identifier.citation	Cement and Concrete Composites, 2024, 145
dc.identifier.issn	0958-9465
dc.identifier.issn	1873-393X
dc.identifier.uri	http://hdl.handle.net/10453/185912
dc.description.abstract	In bridges, UHPC can bear significant sustained tensile stress without cracking under service loading. Its significant impact on the long-term behavior of large-span bridges due to tensile creep characteristics becomes evident. In this paper, both linear and nonlinear tensile creep behavior of steam-cured UHPC was experimentally investigated by using dog-bone-shaped specimens under sustained direct tension for a duration of 360 days. The tensile creep test was conducted under varied tensile stress levels ranging from 0.3ft to 0.9ft. Tensile creep coefficients were calculated by using the experimental results. Nonlinear tensile creep occurs in the steam-cured UHPC when the sustained tensile stress is larger than 0.3ft. The threshold of nonlinear tensile creep is lower than that of normal-strength concrete under compression. When the sustained tensile stress is larger than 0.8ft, tensile creep failure occurs a short time after loading. The nonlinear creep impact under tension is less pronounced than that under compression due to the distinct function of steel fibers within UHPC when subjected to compression and tension force. The findings in the scanning electron microscopy (SEM) test reveal that the mechanism driving the nonlinear tensile creep of UHPC is the damage growth at the fibers-matrix interface under the high sustained tensile stress. A design-oriented model for the creep coefficient of UHPC is developed, which incorporates both linear and nonlinear creep effects. The model's credibility is verified using the experimental results.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Cement and Concrete Composites
dc.relation.isbasedon	10.1016/j.cemconcomp.2023.105323
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0904 Chemical Engineering, 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	Linear and nonlinear tensile creep of steam-cured UHPC
dc.type	Journal Article
utslib.citation.volume	145
utslib.for	0904 Chemical Engineering
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	2025-03-17T07:24:58Z
pubs.publication-status	Published
pubs.volume	145

Abstract:

In bridges, UHPC can bear significant sustained tensile stress without cracking under service loading. Its significant impact on the long-term behavior of large-span bridges due to tensile creep characteristics becomes evident. In this paper, both linear and nonlinear tensile creep behavior of steam-cured UHPC was experimentally investigated by using dog-bone-shaped specimens under sustained direct tension for a duration of 360 days. The tensile creep test was conducted under varied tensile stress levels ranging from 0.3ft to 0.9ft. Tensile creep coefficients were calculated by using the experimental results. Nonlinear tensile creep occurs in the steam-cured UHPC when the sustained tensile stress is larger than 0.3ft. The threshold of nonlinear tensile creep is lower than that of normal-strength concrete under compression. When the sustained tensile stress is larger than 0.8ft, tensile creep failure occurs a short time after loading. The nonlinear creep impact under tension is less pronounced than that under compression due to the distinct function of steel fibers within UHPC when subjected to compression and tension force. The findings in the scanning electron microscopy (SEM) test reveal that the mechanism driving the nonlinear tensile creep of UHPC is the damage growth at the fibers-matrix interface under the high sustained tensile stress. A design-oriented model for the creep coefficient of UHPC is developed, which incorporates both linear and nonlinear creep effects. The model's credibility is verified using the experimental results.

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http://hdl.handle.net/10453/185912