NOVÁK, J. and A. KOHOUTKOVÁ. Fibre reinforced concrete exposed to elevated temperature. In: BROUKALOVÁ, I., et al., eds. Fibre Concrete 2017. Praha, 2017-09-13/2017-09-16. Bristol: IOP Publishing Ltd, 2017. IOP Conference Series: Materials Science and Engineering. vol. 246. ISSN 1757-899X. DOI 10.1088/1757-899X/246/1/012045. Available from: http://iopscience.iop.org/article/10.1088/1757-899X/246/1/012045/pdf
Although concrete when subject to fire performs very well, its behaviour and
properties change dramatically under high temperature due to damaged microstructure and mesostructure. As fibre reinforced concrete (FRC) represents a complex material composed of various components with different response to high temperature, to determine its behaviour and mechanical properties in fire is a demanding task. The presented paper provides a summary of findings on the fire response of fibre FRC. Namely, the information on steel fibre reinforced concrete (SFRC), synthetic fibre reinforced concrete and hybrid (steel + synthetic) fibre reinforced concrete have been gathered from various contributions published up to date. The mechanical properties including the melting point and ignition point of fibres affect significantly the properties of concrete composites with addition of fibres. The combination of steel and synthetic fibres represents a promising alternative how to ensure good toughness of a concrete composite before heating and improve its residual mechanical behaviour and spalling
resistance as well as the ductility after heating. While synthetic fibres increase concrete
spalling resistance, steel fibres in a concrete mix leads to an improvement in both
mechanical properties and resistance to heating effects.