<p>The present study aims to utilize recycled steel fibre obtained from waste tire (TStF) as fibre reinforcement in Ultra High Performance Concrete (UHPC) in combination with waste carbon black (WCB) as cement replacement. The durability and the mechanical strength of the concretes were measured at different ages and different proportions of WCB (2, 4, 6, 8, 10%) with TStF (0.5 and 1%). The mineralogical analysis have also been carried out to confirm the hydration product formation that combined usage of WCB and TStF enhanced the compressive strength of concrete without negatively influencing the durability. Compared to ordinary steel fibre combinations, 0.5% TStF UHPC mixtures rise the most, by 1.69%, 1.35%, 1.29%, and 1.58% at 7, 28, 90, and 190 days. In UHPC, WCB filling and microaggregate action improves cementitious material formation and matrix compactness. Ordinary Portland Cement (OPC) may encapsulate more chloride ions due to its larger specific surface area, although WCB produces more secondary Calcium-silicate-hydrates (C-S-H) gels with silica fume. WCB, silica fume, and Portlandite form the C-S-H gel, which decreases capillary pore interconnectivity and boosts gel volume in the pores despite substantially diminishing capillary volume. Scrap tire regeneration would benefit the surroundings and enhance global warming-related economic development. A marked enhancement in the performance of UHPC coupled with environmental benefits and economical benefit due to simultaneous reduction of cement usage and recycling of steel fibre is obtained.</p>