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Silane-nanoSiO² composite surface modification of steel fibres: a multiscale experimental study of fibre-UHPC interfaces

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Titel: Silane-nanoSiO² composite surface modification of steel fibres: a multiscale experimental study of fibre-UHPC interfaces
Autoren: Tian, Jiefu, Li, Yaqi, Yang, Guojun, Su, Meini, Yang, Zhenjun
Quelle: Tian, J, Li, Y, Yang, G, Su, M & Yang, Z 2026, 'Silane-nanoSiO ² composite surface modification of steel fibres: a multiscale experimental study of fibre-UHPC interfaces', Composites Part B: Engineering, vol. 308, 112999. https://doi.org/10.1016/j.compositesb.2025.112999
Verlagsinformationen: Elsevier BV, 2025.
Publikationsjahr: 2025
Schlagwörter: Composite modification, Interfacial properties, Nano-silica, Silane coupling agent, Ultra high performance concrete, ray computed tomography
Beschreibung: An innovative silane-nanoSiO₂-based surface modification technique for steel fibres was developed recently and proved promising to significantly enhance the strength of ultra-high performance fibre reinforced concrete (UHPFRC). This study aims to further elucidate the fibre-UHPC interfacial modification mechanisms through extensive fibre pullout tests and advanced nano/micro characterization techniques. The FTIR and EDS tests revealed higher Fe-O-Si and Si-O-Si covalent bonds in the composite coating, supporting a proposed chemical modification mechanism. The SEM and WLI tests showed uniform dispersion of nanoSiO₂ particles and a 16.3% increase in surface roughness compared with brass coating. The double-sided pullout tests on 27 specimens with nine parallel embedded fibres demonstrated that bond strength and pullout energy of composite-coated fibres increased with curing age, reaching 14.7MPa and 0.12J at 28 days, which were 345% and 222% higher than brass-coated fibres, respectively. The μXCT scans revealed that the composite coating reduced the thickness, porosity, and weighted average pore diameter of interfacial transition zone (ITZ) by 37.5%, 43.3%, and 47.6%, respectively, compared with brass coating. Fibres with composite coating were fully covered by the UHPC matrix, with bumpy tunnels surrounded by dispersed cracks, unlike smooth tunnels in silane or brass-coated fibres. The XRD and TGA tests indicated that the composite coating accelerated the hydration process and led to more C-S-H hydrates and thus much denser ITZ and much stronger interfacial bond than the silane or brass coating alone.
Publikationsart: Article
Dateibeschreibung: application/pdf
Sprache: English
ISSN: 1879-1069
1359-8368
DOI: 10.1016/j.compositesb.2025.112999
Zugangs-URL: https://research.manchester.ac.uk/en/publications/04a7253d-91ba-45bc-972c-a82b9ced2a23
https://doi.org/10.1016/j.compositesb.2025.112999
https://research.manchester.ac.uk/en/publications/04a7253d-91ba-45bc-972c-a82b9ced2a23
https://doi.org/10.1016/j.compositesb.2025.112999
https://pure.manchester.ac.uk/ws/files/1620675718/AAM-Meini.pdf
Rights: CC BY
Dokumentencode: edsair.dedup.wf.002..f0a133a25932154e1bce55fbed02d923
Datenbank: OpenAIRE
Beschreibung
Abstract:An innovative silane-nanoSiO₂-based surface modification technique for steel fibres was developed recently and proved promising to significantly enhance the strength of ultra-high performance fibre reinforced concrete (UHPFRC). This study aims to further elucidate the fibre-UHPC interfacial modification mechanisms through extensive fibre pullout tests and advanced nano/micro characterization techniques. The FTIR and EDS tests revealed higher Fe-O-Si and Si-O-Si covalent bonds in the composite coating, supporting a proposed chemical modification mechanism. The SEM and WLI tests showed uniform dispersion of nanoSiO₂ particles and a 16.3% increase in surface roughness compared with brass coating. The double-sided pullout tests on 27 specimens with nine parallel embedded fibres demonstrated that bond strength and pullout energy of composite-coated fibres increased with curing age, reaching 14.7MPa and 0.12J at 28 days, which were 345% and 222% higher than brass-coated fibres, respectively. The μXCT scans revealed that the composite coating reduced the thickness, porosity, and weighted average pore diameter of interfacial transition zone (ITZ) by 37.5%, 43.3%, and 47.6%, respectively, compared with brass coating. Fibres with composite coating were fully covered by the UHPC matrix, with bumpy tunnels surrounded by dispersed cracks, unlike smooth tunnels in silane or brass-coated fibres. The XRD and TGA tests indicated that the composite coating accelerated the hydration process and led to more C-S-H hydrates and thus much denser ITZ and much stronger interfacial bond than the silane or brass coating alone.
ISSN:18791069
13598368
DOI:10.1016/j.compositesb.2025.112999