This experimental study aims to investigate the structural behavior of a Carbon Fiber Reinforced Cementitious Matrix (C-FRCM) strengthening and repairing system. The experimental program was designed to assess two strengthening coverage levels: a full-surface coverage (100%) and a patch layout (50%) to evaluate the influence of material distribution. In order to assess the repair/strengthening efficiency, specimens were initially pre-loaded to 50% (in terms of applied force) of the ultimate load to introduce a controlled level of structural damage before the application of the FRCM system. The findings indicate that the Carbon-FRCM system can effectively improve the load-carrying capacity of undamaged slabs and contribute to the structural performance recovery of pre-damaged slabs under the investigated experimental conditions. All strengthened specimens exhibited load capacities higher than that of the control slab, suggesting the potential of the system as a strengthening and repair technique. The results also show that while full coverage provides higher stiffness and more uniform crack control, localized reinforcement can achieve significant improvement in load capacity with reduced material usage. Within the scope of the present experimental investigation, the Carbon-FRCM system exhibited promising structural performance as a strengthening and repair technique for reinforced concrete slabs under the investigated loading conditions.
