Microstructure and mechanical behaviour of 3D printed ultra-high performance concrete after elevated temperatures

Dong, L; Yang, Y; Liu, Z; Ren, Q; Li, J; Zhang, Y; Wu, C

Microstructure and mechanical behaviour of 3D printed ultra-high performance concrete after elevated temperatures

Dong, L Yang, Y Liu, Z Ren, Q Li, J

Zhang, Y Wu, C

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Additive Manufacturing, 2022, 58
Issue Date:: 2022-10-01

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Field	Value	Language
dc.contributor.author	Dong, L
dc.contributor.author	Yang, Y
dc.contributor.author	Liu, Z
dc.contributor.author	Ren, Q
dc.contributor.author	Li, J https://orcid.org/0000-0003-2457-1994
dc.contributor.author	Zhang, Y
dc.contributor.author	Wu, C https://orcid.org/0000-0001-6786-7934
dc.date.accessioned	2023-03-26T21:48:14Z
dc.date.available	2023-03-26T21:48:14Z
dc.date.issued	2022-10-01
dc.identifier.citation	Additive Manufacturing, 2022, 58
dc.identifier.issn	2214-8604
dc.identifier.issn	2214-8604
dc.identifier.uri	http://hdl.handle.net/10453/168424
dc.description.abstract	This study investigated the characteristics of 3D printed ultra-high performance concrete (3DP-UHPC) after elevated temperatures. The effects of the bonding strip, steel fibre, specimen preparation method, loading direction and temperature on the fire resistance of 3DP-UHPC were analysed. The variations in microstructure and mineral composition of 3DP-UHPC after different temperatures were examined using scanning electron microscopy (SEM) and energy spectrum analyser (EDS). The strength degradation mechanism of 3DP-UHPC after the elevated temperatures was revealed in terms of the macro and micro levels. Meanwhile, the compressive strength of 3DP-UHPC after the elevated temperatures was measured, and its corresponding compressive constitutive model was proposed. The experimental results indicated that 3DP-UHPC had certain fire resistance, and the addition of steel fibre and the preparation method improved its fire resistance. The expansion of the crack at the junction of the steel fibre and matrix, as well as the oxidation and decarburization of steel fibre, affected the compressive strength of 3DP-UHPC after 400 ℃. During heating, water vapour escaped from the weak interface of the bonding strip endowed 3DP-UHPC with slightly better elevated-temperature burst resistance as compared to mould-casting ultra-high performance concrete (MC-UHPC). The compressive strength of 3DP-UHPC was the highest after 300 ℃ for the target temperatures set in this study, but the temperature had little effect on the strength difference between each direction of 3DP-UHPC. The compressive constitutive model of 3DP-UHPC after the elevated temperatures was developed, facilitating its engineering application in the field of fire safety.
dc.language	English
dc.publisher	ELSEVIER
dc.relation	National Natural Science Foundation of China51978186
dc.relation.ispartof	Additive Manufacturing
dc.relation.isbasedon	10.1016/j.addma.2022.103032
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0910 Manufacturing Engineering
dc.title	Microstructure and mechanical behaviour of 3D printed ultra-high performance concrete after elevated temperatures
dc.type	Journal Article
utslib.citation.volume	58
utslib.for	0910 Manufacturing Engineering
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	2023-03-26T21:48:13Z
pubs.publication-status	Published
pubs.volume	58

Abstract:

This study investigated the characteristics of 3D printed ultra-high performance concrete (3DP-UHPC) after elevated temperatures. The effects of the bonding strip, steel fibre, specimen preparation method, loading direction and temperature on the fire resistance of 3DP-UHPC were analysed. The variations in microstructure and mineral composition of 3DP-UHPC after different temperatures were examined using scanning electron microscopy (SEM) and energy spectrum analyser (EDS). The strength degradation mechanism of 3DP-UHPC after the elevated temperatures was revealed in terms of the macro and micro levels. Meanwhile, the compressive strength of 3DP-UHPC after the elevated temperatures was measured, and its corresponding compressive constitutive model was proposed. The experimental results indicated that 3DP-UHPC had certain fire resistance, and the addition of steel fibre and the preparation method improved its fire resistance. The expansion of the crack at the junction of the steel fibre and matrix, as well as the oxidation and decarburization of steel fibre, affected the compressive strength of 3DP-UHPC after 400 ℃. During heating, water vapour escaped from the weak interface of the bonding strip endowed 3DP-UHPC with slightly better elevated-temperature burst resistance as compared to mould-casting ultra-high performance concrete (MC-UHPC). The compressive strength of 3DP-UHPC was the highest after 300 ℃ for the target temperatures set in this study, but the temperature had little effect on the strength difference between each direction of 3DP-UHPC. The compressive constitutive model of 3DP-UHPC after the elevated temperatures was developed, facilitating its engineering application in the field of fire safety.

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http://hdl.handle.net/10453/168424