Mechanical properties of Steel Fibre Reinforced Concrete exposed at high temperatures

Steel Fibre Reinforced Concrete (SFRC) is more often considered as an advanced cementitious composite where fibres can act as a profitable replacement of diffused reinforcement, like welded steel mesh, especially for thin cross sections. In this case fire becomes a very important condition in the design. Previous experimental research has shown the benefits in fire resistance of steel fibres when structural elements are bent. A careful mechanical characterization at high temperature of a SFRC used for prefabrication is here presented. Three different tests are considered: four point bending, uniaxial compression and fixed-end uniaxial tension. In this paper only the decay of peak and residual strengths vs. temperature increase for uniaxial compression, uniaxial tension and bending are discussed.