Utilize este identificador para referenciar este registo: https://hdl.handle.net/1822/71733

TítuloThe effects of elevated temperature on the bond behaviour of sand coated GFRP bars to concrete – Definition of bond vs. slip relations
Autor(es)Rosa, I. C.
Firmo, J. P.
Correia, J. R.
Barros, Joaquim A. O.
Palavras-chaveA. Glass fibres
B. Adhesion
B. High-temperature properties
D. Mechanical testing
Glass fibres
Adhesion
High-temperature properties
Mechanical testing
Data2019
EditoraElsevier 1
RevistaComposites Part B: Engineering
Resumo(s)The use of glass fibre reinforced polymer (GFRP) bars as internal reinforcement of concrete structures has been growing, mainly due to the advantages they present over steel reinforcement, namely their low weight, high strength and corrosion resistance. However, at moderately elevated temperatures, especially when approaching the glass transition temperature (Tg) of the polymeric matrix (usually between 65 and 150 °C), the stiffness, strength and bond properties of these rebars are known to be significantly degraded. The first part of this paper presents an experimental investigation comprising tensile and pull-out tests on sand coated GFRP rebars at elevated temperatures under steady-state conditions; the tensile tests were carried out up to 300 °C, whereas the pull-out tests were performed up to 140 °C (measured at the GFRP-concrete interface); two embedment lengths of the rebars were considered. The obtained results confirmed that the stiffness and strength of the GFRP-concrete interface are significantly reduced with temperature increase, especially when the Tg of the GFRP rebars is approached and exceeded. In the second part of the paper, analytical bond vs. slip relations for the GFRP-concrete interface are proposed for each of the tested temperatures; the defining parameters of these local laws were calibrated with the experimental data from the pull-out tests. Moreover, the accuracy of two empirical (relaxation) models in predicting the GFRP-concrete bond strength reduction with temperature was also assessed
TipoArtigo
URIhttps://hdl.handle.net/1822/71733
DOI10.1016/j.compositesb.2018.10.020
ISSN0263-8223
e-ISSN1879-1085
Versão da editorahttps://www.sciencedirect.com/science/article/pii/S1359836818321693
Arbitragem científicayes
AcessoAcesso aberto
Aparece nas coleções:ISISE - Artigos em Revistas Internacionais

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