Effects of CNT modified adhesives and silane chemical pre-treatment on CFRP/steel bond behaviour and durability

D. Borrie; S. Al-Saadi; Xiao Lin Zhao; R. K. Singh Raman; Y. Bai

doi:10.1016/j.conbuildmat.2020.121803

Effects of CNT modified adhesives and silane chemical pre-treatment on CFRP/steel bond behaviour and durability

D. Borrie, S. Al-Saadi, Xiao Lin Zhao, R. K. Singh Raman, Y. Bai

Research output: Journal article publication › Journal article › Academic research › peer-review

26 Citations (Scopus)

Abstract

Carbon fibre reinforced polymers have shown an ability to provide increased strength and rehabilitation properties to steel. However, under extreme environmental conditions adhered CFRP/steel joints undergo detrimental reductions in strength and durability. This paper explores the use of silane chemical barriers and adhesive modifications to improve bond durability and retard environmental damage and restrict bond degradation. Carbon nano tube immersion in adhesives created increases in mechanical properties however the cost, time and dispersion difficulties prevented viable industrial applications. The study experimentally tested steel-CFRP double-lap specimens prepared with combinations of epoxy adhesives and silane pre-treatment. Samples experienced ongoing static service loading while submerged in 5% NaCl solutions of varying temperatures. After immersion for different durations, samples were fatigue loaded for a set number of cycles, after which, static failure loads were determined. Comparing tensile bond strengths quantified the impact that environmental conditioning, fatigue loading and retarding barriers have on the bond durability of CFRP to steel.

Original language	English
Article number	121803
Journal	Construction and Building Materials
Volume	273
DOIs	https://doi.org/10.1016/j.conbuildmat.2020.121803
Publication status	Published - 1 Mar 2021
Externally published	Yes

Keywords

CFRP
Damaged
Environmental exposure
Fatigue life
Silane
Steel

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science

More information

10.1016/j.conbuildmat.2020.121803

Cite this

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abstract = "Carbon fibre reinforced polymers have shown an ability to provide increased strength and rehabilitation properties to steel. However, under extreme environmental conditions adhered CFRP/steel joints undergo detrimental reductions in strength and durability. This paper explores the use of silane chemical barriers and adhesive modifications to improve bond durability and retard environmental damage and restrict bond degradation. Carbon nano tube immersion in adhesives created increases in mechanical properties however the cost, time and dispersion difficulties prevented viable industrial applications. The study experimentally tested steel-CFRP double-lap specimens prepared with combinations of epoxy adhesives and silane pre-treatment. Samples experienced ongoing static service loading while submerged in 5% NaCl solutions of varying temperatures. After immersion for different durations, samples were fatigue loaded for a set number of cycles, after which, static failure loads were determined. Comparing tensile bond strengths quantified the impact that environmental conditioning, fatigue loading and retarding barriers have on the bond durability of CFRP to steel.",

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Effects of CNT modified adhesives and silane chemical pre-treatment on CFRP/steel bond behaviour and durability

Abstract

Keywords

ASJC Scopus subject areas

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