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Fibre reinforced concrete (FRC) is used in applications such as tunnel lining, pavements, bridge deck overlays and floor slabs, where the loads are sustained as well as applied over short durations. In this context, the effect of loading rate, in the quasi-static range, on the flexural properties of FRC have been studied. The three-point bending test of a notched beam, under crack mouth opening displacement (CMOD), is used to determine the post-peak flexural response of the material at loading rates covering 4 orders of magnitude. Two types of fibres are investigated namely, hooked ended steel fibres and polypropylene fibres. The experimental results confirm that the flexural strength increases with an increase in CMOD rate, as expected. It is also seen that the flexural toughness parameters increase with the CMOD rate. Stress-crack opening relations are obtained from inverse analysis using the load-CMOD curves and the probabilistic global search Lausanne (PGSL) optimization algorithm. The study of the variation in the σ-w curves with CMOD rate indicate that the tensile strength associated with crack initiation is dependent of the rate but the post-cracking cohesive stresses are not affected significantly.

Effect of Loading Rate on the Fracture Behaviour of Fibre Reinforced Concrete