For strengthening existing concrete structures with textile reinforced concrete (TRC), anchoring of the TRC layer to the old concrete is crucial. Owing to their very high tensile strength, especially the anchorage lengths of textiles consisting of carbon fibers are to be determined from the pull-out of the filament yarns of the fine-grained concrete. For this reason, further research was necessary to clarify the failure criteria caused by yarn pull-out, which necessitated the development of a pull-out test for textile reinforcements. With the help of the force-crack opening relationships determined within these experimental investigations, the respective bond stress versus the slip relationship (BSR) of the textile reinforcement could be modeled analytically.
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