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TRM versus FRP in flexural strengthening of RC beams: behaviour at high temperatures

Raoof, Saad M.; Bournas, Dionysios A.

Authors

Saad M. Raoof Saad.Raoof@nottingahm.ac.uk

Dionysios A. Bournas



Abstract

The flexural behaviour of RC beams strengthened with TRM and FRP composites was experimentally investigated and compared both at ambient and high temperatures. The investigated parameters were: (a) the strengthening material, namely TRM versus FRP, (b) the number of strengthening layers, (c) the textile surface condition (dry and coated), (d) the textile material (carbon, basalt or glass fibres) and (e) the end-anchorage of the flexural reinforcement. A total of 23 half-scale beams were constructed, strengthened in flexure and tested to assess these parameters and the effectiveness of the TRM versus FRP at high temperatures. TRM exhibited excellent performance as strengthening material in increasing the flexural capacity at high temperature; in fact, TRM maintained an average effectiveness of 55%, compared to its effectiveness at ambient temperature, contrary to FRP which totally lost its effectiveness when subjected to high temperature. In specific, from the high temperature test it was found that by increasing the number of layers, the TRM effectiveness was considerably enhanced and the failure mode was altered; coating enhanced the TRM effectiveness; and the end-anchorage at high temperature improved significantly the FRP and marginally the TRM effectiveness. Finally, the formula proposed by the Fib Model Code 2010 was used to predict the mean debonding stress in the TRM reinforcement, and using the experimental results obtained in this study, a reduction factor to account for the effect of high temperature on the flexural strengthening with TRM was proposed.

Journal Article Type Article
Publication Date Nov 15, 2017
Journal Construction and Building Materials
Print ISSN 0950-0618
Electronic ISSN 1879-0526
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 154
APA6 Citation Raoof, S. M., & Bournas, D. A. (2017). TRM versus FRP in flexural strengthening of RC beams: behaviour at high temperatures. Construction and Building Materials, 154, https://doi.org/10.1016/j.conbuildmat.2017.07.195
DOI https://doi.org/10.1016/j.conbuildmat.2017.07.195
Keywords Reinforced concrete; Textile reinforced mortar; TRM; High temperature; Strengthening; FRCM; TRC; Carbon fibre; Basalt fibre; Glass fibres; Debonding
Publisher URL http://www.sciencedirect.com/science/article/pii/S0950061817315386
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0



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