Effizienzsteigerung von Textilbeton durch Einsatz textiler Bewehrungen nach dem erweiterten Nähwirkverfahren

Efficiency Increase of Textile Reinforced Concrete by Use of Textile Reinforcements from the Extended Warp Knitting Process

The composite material textile reinforced concrete (TRC) is a new, effective and very innovative method for the strengthening of load bearing structures. Apart from further improvements to the strengthening methods, a continual further development of the fibre-matrix combination is at the centre of ongoing research. Due to the high tensile strengths of textile reinforcements made of carbon, it enables very effective strengthening of concrete constructions. However, if the textile fabrics are unfavourably configured, bond and strength damaging crack formations within TRC members can occur. Depending on the load, these crack formation effects are substantially influenced by the bond and the size of yarn undulation, which depends on the processing of the fabric. The danger of bond failure by delamination, which particularly occurs in areas of concentrated load introduction into the textile reinforcement, such as final anchorages and overlaps, is especially critical. It results in a reduction of the usable tensile load bearing capacity in the entire member. For this reason, an improved textile manufacturing method based on warp knitting technology was developed. By means of this method, yarn undulation can be reduced considerably. The article on hand describes comparative examinations of the bond and strength properties of tensile loaded TRC elements. The results show that the development of the extended warp knitting process was a substantial step toward a further improvement of the properties of TRC.