Effect of incorporating different quantities of recovered steel fibres on the mechanical properties of new steel fibre-reinforced concrete
Guanzhi Liu (Universitat Politecnica de Catalunya)
Maria Koetsier (Student TU Delft)
Nikola Tošić (Universitat Politecnica de Catalunya)
Wim Ekkelenkamp (Twee “R” Recycling Groep)
Marija Nedeljković (Rijkswaterstaat)
Mladena Luković (TU Delft - Civil Engineering & Geosciences)
Albert de la Fuente (Universitat Politecnica de Catalunya)
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Abstract
This study aims to investigate the effect of incorporating different quantities of steel fibres recovered during concrete recycling on the mechanical properties of new steel fibre reinforced concrete (SFRC). Mixes contained 20 kg/m³ and 25 kg/m³ of steel fibres, with recovered steel fibres at replacement levels of 0%, 10%, 30%, and 100%. The recovered fibres were tested and categorized to determine the effect of recycling on fibre properties. The compressive strength, elastic modulus, stress–strain behaviour in compression, residual flexural strength of SFRC and inductive test were tested. The results demonstrate that incorporating a small proportion of recycled fibre alongside virgin fibre is a feasible approach, with a 10% recycled fibre replacement yielding superior performance compared to using 100% virgin fibre alone.