Materiales de Construcción, Vol 67, No 326 (2017)

Post-cracking tensile behaviour of steel-fibre-reinforced roller-compacted-concrete for FE modelling and design purposes

N. Jafarifar
School of Architecture and Built Environment, Robert Gordon University, United Kingdom

K. Pilakoutas
Department of Civil and Structural Engineering, University of Sheffield, United Kingdom

H. Angelakopoulos
Department of Civil and Structural Engineering, University of Sheffield, United Kingdom

T. Bennett
School of Civil, Environmental and Mining Engineering, University of Adelaide, Australia


Fracture of steel-fibre-reinforced-concrete occurs mostly in the form of a smeared crack band undergoing progressive microcracking. For FE modelling and design purposes, this crack band could be characterised by a stress-strain (σ-ε) relationship. For industrially-produced steel fibres, existing methodologies such as RILEM TC 162-TDF (2003) propose empirical equations to predict a trilinear σ-ε relationship directly from bending test results. This paper evaluates the accuracy of these methodologies and their applicability for roller-compacted-concrete and concrete incorporating steel fibres recycled from post-consumer tyres. It is shown that the energy absorption capacity is generally overestimated by these methodologies, sometimes up to 60%, for both conventional and roller-compacted concrete. Tensile behaviour of fibre-reinforced-concrete is estimated in this paper by inverse analysis of bending test results, examining a variety of concrete mixes and steel fibres. A multilinear relationship is proposed which largely eliminates the overestimation problem and can lead to safer designs.


Concrete; Composite; Fibre reinforcement; Metal reinforcement; Waste treatment

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