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Recycling potential of recycled carbon fibers used in textile concrete from a technical and environmental point of view

As an important element in construction industry, cement production caused alone 2 % of total greenhouse gas emissions in Germany in 2017 and global average was even with a greater value, 8 % (WWF 2019). Considering the great impact of construction industry on the environment, Fiber reinforcement (carbon or glass) is seen as a meaningful alternative to steel reinforcement in the production of concrete. Due to their low weight, high strength and lifetime, carbon fibers have been increasingly used in construction industry. On the one hand, the use of CF reinforced concrete enables great amount of resource savings compared to conventional concrete, specifically steel reinforced concrete (Böhm et al. 2018). On the other hand, CFs have some disadvantages, such as high cost, energy intensive production process and challenging end-of-life (EOL) handling (Zhang et al. 2020).

The application of carbon fibers (CF) has been increasing in the construction industryas they allow production of lightweight concrete structures. Aside from many advantages, theend-of-life management of carbon fiber reinforced concrete remains challenging. Through thisstudy, we aimed to assess the recycling potential of recycled carbon fibers (rCF) that were usedin concrete, considering the technical and environmental aspects. To identify the separation potentialof carbon fibers from concrete, mechanical processing by means of hammer mill with differentmachine settings was conducted. In addition, a life cycle assessment was performed evaluatingtwo life cycles of carbon fibers and identifying the hotspots. From the results of mechanicalprocessing, it is seen that with the increased weight percentage of separated carbon fibers, thefine portion, which is a mix of carbon fibers and concrete, also increased. In addition, two assessedparameters, the total mass and length division of separated carbon fibers were observedto have the greatest value in two different machine settings. From an environmental point of view,virgin carbon fiber and concrete production were the highest contributors to environmental impacts.Furthermore, recycling through pyrolysis was found to be environmentally advantageous compared to virgin carbon fiber production.

Copyright:	© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle:	Recy & Depotech 2022 (November 2022)
Seiten:	6
Preis:	€ 3,00
Autor:	Berfin Bayram V. Overhage Karoline Raulf Prof. Dr. Kathrin Greiff T. Gries
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