Textile-reinforced concrete is a new composite material that is characterised by thin-walled components and workpieces. In the usual manufacture processes, the textile is embedded by laminating, spinning or casting the concrete. In addition, the spraying of concrete onto a textile reinforcement has become an established method for strengthening and repair measures. These processes are very well suited to unique applications, but the high amount of effort required for shuttering means they are only suitable to a limited extent for series production. Extrusion would appear to be an interesting alternative for such applications. Extrusion is already used successfully with monolithic building materials for the manufacture of resolved cross-sections in large numbers. However, additional reinforcement is required for structural elements, especially those made from concrete, that are subject to tensile or bending stresses. Installing this reinforcement and ensuring an adequate bond has so far represented a significant barrier to the establishment of extrusion in series production. This article describes the essential requirements for both the microconcrete mixture and the geometry of the mouthpiece in order to successfully manufacture slender textile reinforced elements.
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