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. ... Read more

Betonnen bruggen kunnen worden versterkt door het storten of plakken van een laag ultra-hogesterkte vezelversterkt beton (UHPFRC) aan één of beide kanten van de liggers. Hiermee kan de dwarskrachtcapaciteit worden vergroot. Bij deze toepassing is de hechting tussen het oude en het nieuwe beton van groot belang. In een bachelor eindproject aan de TU Delft is gekeken of de delaminatie tussen normaal beton en UHPFRC met infrarood thermografie kan worden beoordeeld. ... Read more