Recent research is showing that the addition of Recycled Steel Fibres(RSF) from wasted tyres can decrease significantly the brittle behaviour of cementbased materials, by improving its toughness and post-cracking resistance. In thissense, Recycled Steel Fibre Reinforced Concrete (RSFRC) seems to have thepotential to constitute a sustainable material for structural and non-structuralapplications. To assess this potential, experimental and numerical research wasperformed on the use of RSFRC in elements failing in bending and in beams failing in shear. The values of the fracture mode I parameters of the developed RSFRCwere determined by performing inverse analysis with test results obtained in threepoint notched beam bending tests. To assess the possibility of using RSF as shearreinforcement in Reinforced Concrete (RC) beams, three point bending tests wereexecuted with three series of RSFRC beams flexurally reinforced with a relativelyhigh reinforcement ratio of longitudinal steel bars in order to assure shear failurefor all the tested beams. By performing material nonlinear simulations with acomputer program based on the finite element method (FEM), the applicability ofthe fracture mode I crack constitutive law derived from the inverse analysis isassessed for the prediction of the behaviour of these beams. The performance ofthe formulation proposed by RILEM TC 162 TDF and CEB-FIP 2010 for theprediction of the shear resistance of fibre reinforced concrete elements was alsoevaluated.
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