Effects of silane treatment on the bond between steel fibres and mortar

Miller, HD; Akbarnezhad, A; Mesgari, S; Foster, SJ

Effects of silane treatment on the bond between steel fibres and mortar

Miller, HD Akbarnezhad, A Mesgari, S Foster, SJ

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Publisher:: ICE publishing
Publication Type:: Journal Article
Citation:: Magazine of Concrete Research, 2022, 74, (10), pp. 528-540
Issue Date:: 2022-05-01

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Field	Value	Language
dc.contributor.author	Miller, HD
dc.contributor.author	Akbarnezhad, A
dc.contributor.author	Mesgari, S
dc.contributor.author	Foster, SJ
dc.date.accessioned	2023-06-30T21:33:51Z
dc.date.available	2023-06-30T21:33:51Z
dc.date.issued	2022-05-01
dc.identifier.citation	Magazine of Concrete Research, 2022, 74, (10), pp. 528-540
dc.identifier.issn	0024-9831
dc.identifier.issn	1751-763X
dc.identifier.uri	http://hdl.handle.net/10453/171055
dc.description.abstract	The ability of fibres to resist crack growth in fibre-reinforced concrete can be significantly influenced by the fibre-matrix bond. This investigation reveals surface treatment of fibres as a viable technique for developing a uniform bond along the fibre-cement interface to resist growth of microcracks and thereby complement the physical restraint against pull-out provided by fibres' shape and friction. Previous reports have shown effective chemical treatment of glass, carbon and polypropylene fibres. However, research into chemical surface treatment processes for steel fibres, the most common in concrete, is scarce and focused on corrosion and dispersion, rather than the fibre-matrix bond. Here, a silane treatment technique is proposed to strengthen the steel fibre-cementitious matrix bond. Surface energy measurements and X-ray photoelectron spectroscopy demonstrate the effectiveness of this treatment. Fibre pull-out tests conducted on silane-treated fibres show an apparent increase in pull-out energy, accompanied by a delay in reaching the peak load, compared with untreated fibres, suggesting increased resistance to crack initiation and growth. Furthermore, the results indicate improved flexural strength and direct tensile strength of mortar reinforced with silane-treated fibres compared with untreated fibres. The improvements are further corroborated by results from restrained drying shrinkage and volume of permeable voids.
dc.language	en
dc.publisher	ICE publishing
dc.relation.ispartof	Magazine of Concrete Research
dc.relation.isbasedon	10.1680/jmacr.20.00366
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Effects of silane treatment on the bond between steel fibres and mortar
dc.type	Journal Article
utslib.citation.volume	74
utslib.for	0905 Civil Engineering
utslib.for	1202 Building
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/DVC (Research)
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/DVC (Research)/Research Office
pubs.organisational-group	/University of Technology Sydney/DVC (Research)/Research Office/Research Office (Faculty Engagement)
utslib.copyright.status	closed_access	*
dc.date.updated	2023-06-30T21:33:50Z
pubs.issue	10
pubs.publication-status	Published
pubs.volume	74
utslib.citation.issue	10

Abstract:

The ability of fibres to resist crack growth in fibre-reinforced concrete can be significantly influenced by the fibre-matrix bond. This investigation reveals surface treatment of fibres as a viable technique for developing a uniform bond along the fibre-cement interface to resist growth of microcracks and thereby complement the physical restraint against pull-out provided by fibres' shape and friction. Previous reports have shown effective chemical treatment of glass, carbon and polypropylene fibres. However, research into chemical surface treatment processes for steel fibres, the most common in concrete, is scarce and focused on corrosion and dispersion, rather than the fibre-matrix bond. Here, a silane treatment technique is proposed to strengthen the steel fibre-cementitious matrix bond. Surface energy measurements and X-ray photoelectron spectroscopy demonstrate the effectiveness of this treatment. Fibre pull-out tests conducted on silane-treated fibres show an apparent increase in pull-out energy, accompanied by a delay in reaching the peak load, compared with untreated fibres, suggesting increased resistance to crack initiation and growth. Furthermore, the results indicate improved flexural strength and direct tensile strength of mortar reinforced with silane-treated fibres compared with untreated fibres. The improvements are further corroborated by results from restrained drying shrinkage and volume of permeable voids.

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http://hdl.handle.net/10453/171055