How does concrete strength affect the fire resistance?
Journal of Structural Fire Engineering
ISSN: 2040-2317
Article publication date: 4 March 2020
Issue publication date: 20 August 2020
Abstract
Purpose
The aim of the research was to investigate the effect of concrete strength on the fire resistance of structures. At first, it may seem contradictory that higher concrete strengths can decrease the fire resistance of building structures. However, if the strength of the concrete exceeds a maximum value, the risk of spalling (the detachment of the concrete surface) significantly.
Design/methodology/approach
Prefabricated structural elements are often produced with higher strength. The higher concrete strengths generally do not cause a reduction in the load bearing capacity, but it can have serious consequences in case of structural fire design. Results of two prefabricated elements, namely, one slab (TT shaped panel) and one single layer wall panel, were examined. Results of the specimen with the originally designed composition and a specimen with modified concrete composition were examined, were polymer fibres were added to prevent spalling.
Findings
As a result of the experiments, more strict regulations in the standards the author is suggested including more strict regulations in the standards. It has been proved that to ensure the fire safety of the reinforced concrete structures, it is required after polymer fibres even in lower concrete strength class than prescribed by the standard. In addition, during the classification and evaluation of structures, it is advisable to introduce an upper limit of allowed concrete strength for fire safety reasons.
Originality/value
As a result of the experiments, the author suggests including more strict regulations in the standards. It has been proved that to ensure the fire safety of the reinforced concrete structures, it is necessary to require the addition of polymer fibres even in lower concrete strength class than prescribed by the standard. In addition, during the classification and evaluation of structures, it is advisable to introduce an upper limit of allowed concrete strength for fire safety reasons.
Keywords
Acknowledgements
The author of the paper thank for the support of the research received through the project NVKP_16-1-0019 “Materials and Experimental Development of Concrete Products with High Resistance (Chemical Corrosion, Refractory and Antifreeze)”. This research was also supported by the János Bolyai Research Scholarship of the Hungarian Academy of Sciences. Supported by the ÚNKP-19-4 new national excellence program of the ministry for innovation and technology”. The research reported in this paper was supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of the Water sciences and Disaster Prevention research area of the Budapest University of Technology and Economics (BME FIKP-VÍZ).
Citation
Lubloy, E. (2020), "How does concrete strength affect the fire resistance?", Journal of Structural Fire Engineering, Vol. 11 No. 3, pp. 311-324. https://doi.org/10.1108/JSFE-10-2019-0035
Publisher
:Emerald Publishing Limited
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