Abstract Although steel is one of the most common and useful reinforcing materials worldwide, it has always had a major disadvantage: it rusts. This study proposes the utilization of high performance cementitious mortar (HPCM) as a repairing material for corroded RC elements. The experimental study was executed in two phases. Phase one evaluated the physical properties and corrosion resistance of the HPCM layer and compared the recorded results with those of conventional concrete. Different tests and measurements were conducted (XRF, XRD, SEM images, stereoscopic images, and half-cell readings) for this purpose. Phase two studied the structural behavior of corroded RC beams that were repaired with an HPCM layer. The investigated parameter was the effect of adding HPCM layers with different thicknesses to the bottom chord of specimens subjected to different corrosion levels. Six corroded specimens were tested under three-point loading with different corrosion levels (10%, 15%, and 20% of mass loss) and different HPCM layer thicknesses (0, 50, and 80 mm), in addition to three non-corroded control specimens with different HPCM layer thicknesses (0, 50, and 80 mm). From the results, the specimens with the HPCM layer material confirmed the effective behavior of this material to reduce corrosion. Moreover, the HPCM layer showed a significant positive impact on the ultimate capacity and cracking pattern of the tested RC specimens. [ABSTRACT FROM AUTHOR]