# Shear Capacity of Textile-Reinforced Concrete Slabs without Shear Reinforcement  
[PERSON]  
1 Institute of Structural Concrete, RWTH Aachen University, 52074 Aachen, Germany;  
[EMAIL_ADDRESS] (V.A.); [EMAIL_ADDRESS] (J.H.); [EMAIL_ADDRESS] (M.C.)  
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[PERSON]  
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[PERSON] and [PERSON]  
bridges [16; 17; 18; 19] as well as for small road bridges [20], especially in the transversal structural system. TRC slabs do not require additional protective layers (e.g., epoxy coating or bitumen) and thus the concrete can be driven or walked on directly. In high-rise construction, a promising application for TRC slabs are multi-storey car parks [21], where the question of corrosion-resistance because of exposition to deicing-salt as well as the maximization of clear floor height without increasing the building height dominate the design--both are strong arguments for the use of TRC.  
The ongoing research on fundamental shear design models [22; 23; 24; 25; 26; 27] and the numerous current research projects on shear in Europe [28; 29; 30; 31; 32; 33; 34; 35; 36; 37] indicate that this topic is far from being solved for steel reinforced concrete. This foreshadows the long and tedious way toward an adequate level of knowledge on shear design of TRC.  
TRC distinctly differs from fiber reinforced polymer (FRP) bar reinforced concrete, which is much more comparable to conventional concrete in component size, reinforcement diameter, stiffness in transversal direction, and shape. For FRP, extensive research exists on elements without (e.g., [38; 39; 40; 41; 42; 43; 44; 45; 46] and with (e.g., [47; 48; 49; 50; 51]) transversal reinforcement. Due to the great experience in research and practice, there are design provisions in several international codes (e.g., [52; 53; 54]). However, in contrast to FRP-reinforced concrete, research on TRC is still in its infancy. The existing models for FRP are an excellent starting point, but research on TRC should check unbiasedly fundamental assumptions on load-bearing mechanisms in order to avoid fallacies in design. The \"middle of shear\" ([PERSON]'s famous dictum in [55]) for TRC is one of those fundamental topics targeted in a large-scale coordinated research program on TRC and carbon reinforced concrete in Germany named \"Carbon Concrete Composites (C\({}^{3}\))-Project\" [56]. In the subproject C\({}^{3}\)-B3 [57], experimental and theoretical investigations on shear were performed by the Institute of Structural Concrete at RWTH Aachen University. Meanwhile, other researchers in Europe are investigating similar issues on shear capacity of filigree TRC beams [3; 58] or the capacity of 3D textile reinforced elements [59].  
The aim of the present article is to give insight on fundamental questions for shear design of TRC without shear reinforcement. Using the results of a systematic experimental investigation on slab segments, the influence of the component's height and the effect of shear slenderness are discussed. The comparison of shear capacity predictions from selected existing models to the test results indicates that TRC with epoxy-impregnated carbon textiles as longitudinal reinforcement exhibits a similar shear behavior compared to steel- or FRP-reinforced concrete components. This is the first step toward the transfer or adaption of existing shear design models to TRC.