Experimental study of reinforced concrete beams reinforced with hybrid spiral-hooked end steel fibres under static and impact loads

Hao, Y; Xiao, D; Hao, H; Li, J; Li, J

Experimental study of reinforced concrete beams reinforced with hybrid spiral-hooked end steel fibres under static and impact loads

Hao, Y Xiao, D Hao, H Li, J

Li, J

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Publisher:: SAGE PUBLICATIONS INC
Publication Type:: Journal Article
Citation:: Advances in Structural Engineering, 2022, 25, (15), pp. 3019-3030
Issue Date:: 2022-11-01

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Field	Value	Language
dc.contributor.author	Hao, Y
dc.contributor.author	Xiao, D
dc.contributor.author	Hao, H
dc.contributor.author	Li, J https://orcid.org/0000-0003-2457-1994
dc.contributor.author	Li, J https://orcid.org/0000-0003-2457-1994
dc.date.accessioned	2023-04-26T03:38:20Z
dc.date.available	2023-04-26T03:38:20Z
dc.date.issued	2022-11-01
dc.identifier.citation	Advances in Structural Engineering, 2022, 25, (15), pp. 3019-3030
dc.identifier.issn	1369-4332
dc.identifier.issn	2048-4011
dc.identifier.uri	http://hdl.handle.net/10453/170092
dc.description.abstract	Discrete short steel fibres were proposed to be mixed with concrete for arresting cracks and enhancing the post-cracking resistance. It has been proven in previous tests that spiral steel fibres possessed markedly higher bonding to concrete matrix, leading to significantly improved performance of steel fibre reinforced concrete (SFRC) in terms of crack controllability, impact resistance, deformability and energy absorption capability. However, at the initial stage of cracking, SFRC reinforced with spiral fibres has relatively lower resistance to crack opening as compared to that reinforced with other types of steel fibres because of spiral shape stretching. To overcome this shortcoming, in the present study, short hooked-end steel fibres that exhibit high pull-out resistance at the crack initiation stage were mixed with spiral steel fibres in the normal-strength concrete matrix. A total volume fraction of 1% of hybrid steel fibres was mixed to cast SFRC specimens. With various mix ratios between spiral and hooked-end fibres considered, five batches of SFRC specimens were tested. Uniaxial compressive tests and four-point bending tests were carried out to compare the mechanical properties of SFRC materials with hybrid fibres while three-point bending tests on SFRC structural beams under static, drop-weight impact and post-impact static loading tests were conducted to investigate the structural performances. An equal dosage of hooked-end and spiral fibres was found to outperform other blend proportions to provide synergetic reinforcement to concrete matrix in terms of post-cracking resistance, energy absorption capacity and post-impact performance.
dc.language	English
dc.publisher	SAGE PUBLICATIONS INC
dc.relation.ispartof	Advances in Structural Engineering
dc.relation.isbasedon	10.1177/13694332221113045
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Civil Engineering
dc.title	Experimental study of reinforced concrete beams reinforced with hybrid spiral-hooked end steel fibres under static and impact loads
dc.type	Journal Article
utslib.citation.volume	25
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	*
dc.date.updated	2023-04-26T03:38:18Z
pubs.issue	15
pubs.publication-status	Published
pubs.volume	25
utslib.citation.issue	15

Abstract:

Discrete short steel fibres were proposed to be mixed with concrete for arresting cracks and enhancing the post-cracking resistance. It has been proven in previous tests that spiral steel fibres possessed markedly higher bonding to concrete matrix, leading to significantly improved performance of steel fibre reinforced concrete (SFRC) in terms of crack controllability, impact resistance, deformability and energy absorption capability. However, at the initial stage of cracking, SFRC reinforced with spiral fibres has relatively lower resistance to crack opening as compared to that reinforced with other types of steel fibres because of spiral shape stretching. To overcome this shortcoming, in the present study, short hooked-end steel fibres that exhibit high pull-out resistance at the crack initiation stage were mixed with spiral steel fibres in the normal-strength concrete matrix. A total volume fraction of 1% of hybrid steel fibres was mixed to cast SFRC specimens. With various mix ratios between spiral and hooked-end fibres considered, five batches of SFRC specimens were tested. Uniaxial compressive tests and four-point bending tests were carried out to compare the mechanical properties of SFRC materials with hybrid fibres while three-point bending tests on SFRC structural beams under static, drop-weight impact and post-impact static loading tests were conducted to investigate the structural performances. An equal dosage of hooked-end and spiral fibres was found to outperform other blend proportions to provide synergetic reinforcement to concrete matrix in terms of post-cracking resistance, energy absorption capacity and post-impact performance.

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http://hdl.handle.net/10453/170092