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The experimental behavior of CFRP-strengthened reinforced concrete slabs with fire protection systems subjected to standard fire exposure

Saeed Bakhtiyari (Department of Fire Engineering, Road, Housing and Urban Development Research Center, Tehran, Iran)
Arsalan Kalali (Department of Fire Engineering, Road, Housing and Urban Development Research Center, Tehran, Iran)
Leila Taghi Akbari (Department of Fire Engineering, Road, Housing and Urban Development Research Center, Tehran, Iran)
Farhang Farahbod (Department of Structural Engineering, Road, Housing and Urban Development Research Center, Tehran, Iran)

International Journal of Disaster Resilience in the Built Environment

ISSN: 1759-5908

Article publication date: 12 June 2017

Abstract

Purpose

This paper aims to evaluate fire resistance of carbon fiber-reinforced polymer (CFRP)-strengthened concrete slabs in two forms of unprotected and protected against fire.

Design/methodology/approach

To achieve the objective, an unstrengthened and two CFRP-strengthened concrete slabs were first subjected to increasing gravity loading until failure. Subsequently, the unstrengthened concrete slab was placed on a furnace and was subjected to a constant service gravity load and then, the temperature of the furnace was increased according to a standard temperature–time curve until the failure of the slab occurred. This slab was strengthened by CFRP with two different amounts and then, in two cases of unprotected and protected against fire, was tested in accordance with the aforementioned method.

Findings

The gravity test results revealed that CFRP strips bonded to concrete slabs increased the load-bearing capacity considerably. So, this method can be suitable for flexural strengthening of concrete slabs. The fire test results showed that because of more load-bearing capacity and subsequently increase in service gravity load, the strengthened concrete slab failed in a short time due to the lack of CFRP resistance against fire. By contrast, the protected specimens resisted the fire in a considerable time. In addition, it was revealed that details of fire protective coating had an important effect on fire resistance duration.

Originality/value

It is notable that in the literature, there is a lack of data on the fire endurance of fiber-reinforced polymer-strengthened concrete slabs alone without any fire protection system. Furthermore, the applicability and effectiveness of a new kind of spray mineral fire protective coatings was evaluated.

Keywords

Acknowledgements

The authors would like to appreciate Composite Sazeh Moghavem Company for supplying the needed FRP materials and their implementation. In this regard, the authors would also like to appreciate valuable cooperation of Dr Sarafraz and staff of the Fire Department of BHRC: Mr Koosha, Mr Jamali Ashtiani, Mrs Doroodiani and Mrs Askari Moghadam. This paper forms part of a special section “Selected papers from CIB World Building Congress 2016”.

Citation

Bakhtiyari, S., Kalali, A., Taghi Akbari, L. and Farahbod, F. (2017), "The experimental behavior of CFRP-strengthened reinforced concrete slabs with fire protection systems subjected to standard fire exposure", International Journal of Disaster Resilience in the Built Environment, Vol. 8 No. 3, pp. 238-250. https://doi.org/10.1108/IJDRBE-07-2016-0029

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited