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P. Preinstorfer, J. Kollegger:
"Splitting failure mode in textile reinforced concrete";
Talk: fib Symposium 2019 CONCRETE Innovations in Materials, Design and Structures 27-29 May 2019, Kraków, Poland, Krakau; 2019-05-27 - 2019-05-29; in: "CONCRETE Innovations in Materials, Design and Structures", (2019), ISBN: 978-2-940643-00-4; 282 - 288.

Textile reinforcement is a key innovation in the field of civil engineering. It consists of rovings made out of thousands of filaments. To improve bond performance these textiles are impregnated afterwards with either reactive resins (mainly epoxy resin) or aqueous dispersions (mainly styrene butadiene or styrene-acrylate copolymers). Experiments carried out at the Institute of Structural Engineering at TU Wien showed the high potential of structural elements reinforced with epoxy impregnated textile reinforcement. However a spalling of the concrete cover due to high bond stresses could be observed in most cases, subsequently leading to premature failure of the test specimens. Based on this observation further tests on the bond performance of textile reinforcement bonded in high performance concrete were carried out using a special bond performance test adapted for textile reinforcement in particular. The research described in this paper shows that the roving geometry and the production process of the textile reinforcement is responsible for high splitting forces orthogonal to the textile layer, resulting in a spalling of the concrete cover. For further developments in textile reinforced concrete it is very important to understand the bond behaviour of textile reinforcement. All findings within this research are small steps toward reaching this goal. © Federation Internationale du Beton (fib) - International Federation for Structural Concrete, 2019.

Bond behaviour, Longitudinal cracking, Textile reinforcement