The demand for the recovery of carbon fibers from old components or the recycling of carbon fiber waste is increasing with the growing use of carbon fibers in many sectors (e.g., automotive, aerospace). Although components reinforced with semi-finished carbon fiber products have already been in operation for several years, the use of recycled or reused carbon fibers (rCF) in the construction sector, especially as concrete reinforcement, opens up a promising opportunity to close the carbon material cycle. In the present study, tensile tests were carried out on yarns made of rCF produced with two different impregnations (thermoplastic and thermoset) and compared with two similarly impregnated yarns made of virgin carbon fibers. The findings indicate substantial disparities in the mechanical properties, particularly in tensile strength and stiffness. These findings signify an inaugural phase in the assessment of rCF yarns for structural applications and underscore the feasibility of subsequent enhancement of rCF processes to attain performance benchmarks commensurate with those of virgin carbon fibers.