Given the considerable number of concrete structures either damaged or nearing the end of their lifespan, it becomes crucial to undertake substantial repairs. This is essential not only to address existing deterioration but also to ensure the preservation and prolonged durability of these structures. This study aims to explore the usability of innovative concretes in the repair of damaged reinforced concrete structures. However, these repairs must be executed in an environment-friendly manner. Therefore, the envisioned characteristics aimed to develop highly fluid concretes comprised of readily available natural ingredients or sourced from recycled materials. In pursuit of this goal, the developed concretes draw inspiration from the principles of self-compacting concrete. Fluidity has been boosted by limiting aggregate diameters (Dmax = 5 mm), reducing the proportion of gravel, and increasing the proportion of sand. The resulting concrete was designated as Self-Compacting Sand Concrete (SCSC). Three distinct formulations of SCSC concrete were devised: SCSC-LF, enriched with limestone fillers; SCSC-Pr, incorporating natural perlite; and SCSC-Pz, featuring natural pozzolan. The substrates were constructed using standard vibrated concrete of ordinary class (OC). The repair success of composites, consisting of an OC substrate and a layer of SCSC, was evaluated under tensile stress. The results are highly promising, demonstrating the efficacy of concrete-reinforced composite (SCSC) systems in effectively repairing damaged concrete structures.