In recent years, the use of natural flax fibers as a reinforcement in composite building materials have witnessed a growing interest amongst research communities due to their green, economical, and good mechanical properties. These benefits are only slightly limited when using biodegradable or bio-based resins for the impregnation. Yet, robust load-bearing models to design concrete components reinforced with textiles made of natural fibers – including flax fibers – are still underdeveloped or even lacking. In this paper, the load-bearing behavior under uniaxial tension load of concrete components reinforced with textiles made of impregnated flax fibers is investigated. To this, the results of uniaxial tensile tests on concrete components with three-layered reinforcements impregnated (I) and non-impregnated (NI)) are presented and discussed. The tests consisted in systematically varying textile parameters, such as the fineness of the weft threads, the spacing between warp and weft threads, or the number of reinforcement layers. Overall, the results indicate that reinforcement made of flax fibers works satisfactory for concrete components bearing uniaxial tension. Furthermore, an increase in failure load was achieved compared to concrete components without reinforcement. The stress-strain-diagrams show that the curves can be divided into three typical areas: Uncracked cross-section (State I), phase of initial crack formation (State IIa) and phase of completed crack formation (State IIb). Also, a very finely distributed crack pattern with multiple cracks was observed. The impregnated textiles reached higher failure stresses with less strains in comparison to the textiles without impregnation.

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