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Recycling concrete with reinforcement made of basalt fibre polymers: investigations on the composite and tensile load‐bearing behaviour The use of recycling concrete is subject to restrictions in Germany, which prevent its use in environmental conditions containing de‐icing salt of exposure classes XD3 and XS3. To overcome these normative barriers, the Munich UAS is conducting research on the use of alternative reinforcement materials that completely eliminate reinforcement corrosion induced by chlorides. In this regard, non‐corrosive fibre composite bars, made of basalt, are employed, which offer ecological advantages over reinforcements made of stainless steel, glass fibre or carbon. The investigations presented here on the composite and tensile load‐bearing behaviour of basalt fibre‐reinforced polymers have arisen as part of a current research project examining the use of this type of reinforcement in bridge caps made of recycling concrete. In addition to preliminary concrete technology studies on the use of up to 100 % recycled aggregates, composite specimens made of recycled concrete and basalt fibre reinforced polymer were tested to provide insights on the load‐bearing behaviour under static and cyclic conditions. [ABSTRACT FROM AUTHOR]

Investigation on tension and bonding behaviour of basalt fibre reinforced polymers in concrete structures For retrofitting of RC structures, the concrete cover of the renewed reinforcement has to be sufficient to ensure the durability. Alternative reinforcement like rebars of basalt fibre reinforced polymers (BFRP) gives the possibility to minimize the concrete cover ensuring durable structures due to their resistance against carbonation and chlorides. In this paper investigations on load‐bearing behaviour of BFRP reinforced test specimens as an excerpt from a research project on basalt fibre reinforced concrete as repairing material with shotcrete and also basalt rebars as additional strengthening reinforcement for fair faced concrete facades are presented. The tested BFRP rebars show higher tension strength and lower Young's Modulus as comparable steel reinforcement bars. In centrical tension tests on the BFRP reinforced concrete specimen longitudinal cracking due to high tension in the contact zone and a higher number and also higher widths of crosswise cracking appear. The load bearing behaviour can be confirmed by numerical simulation. The results of the investigation with the incident light microscope on prepared specimen after tension tests show an enhanced number of microcracks in the contact zone between BFRP rebar and cement matrix. In pull out tests always the concrete failed, never the BFRP rebars. The results of this investigation confirm the possibility to ensure durable concrete structures using BFRP reinforcement. Further tests have been carried out on the flexural strength behaviour, the fatigue strength and durability. At the moment BFRP rebars of various designs are tested. [ABSTRACT FROM AUTHOR]