ABSTRACT
High temperature affects concrete in various ways: porosity increase, thermal expansion, excessive pore pressure, inconsistent heat deformation between mortar and aggregates (Tai et al. 2011, Noumowé et al. 2009, Georgali & Tsakiridis 2005). The use of fibers in concrete mixtures results in all the above mentioned disadvantages. Despite the positive effect of the fibers, it has been found that fiber reinforced concrete structures subjected to high temperature lose a significant part of their compressive strength (Sideris & Manita 2013, Ding et al. 2012, Sideris et al. 2009, Poon et al. 2004) and flexural ductility (Sukontasukkul et al. 2010).
