High-performance and durable fiber concrete made of recycled carbon fibers

Author(s): Magdalena Kimm, Thomas Gries
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 772-779
Total Pages: 848
Language: English

Abstract: The controversial issue of the reuse of carbon fibre waste from high-performance parts is still unsolved. Especially in the construction industry, the use of carbon-textile reinforced concrete is increasing. Current waste masses of carbon fibres lie around 4.000 t per year in Europe which shall rise up to 30.000 t per year within the next 10 years. However, recycled carbon fibres are up to 5 times cheaper than new fibres - and offer almost identical performance. Only the shortening of the fibre length currently prevents the material from returning to its original application. Therefore, a new application for recycled carbon fibres in fibre concrete is currently developed.
Tests on carbon fibre concrete specimen show an increase in bending strength of approx. 14 % compared to the benchmark of glass fibre concrete, while the required fibre mass could be reduced by 75 mass-%. Therefore, material efficiency of the carbon fibre reinforcement is increased and the long-term durability of the novel composite material is significantly improved. First estimations show, that a recycling rate of 22 % of the current carbon fibre waste in Europe can be achieved by replacing 20 % of steel fibres for fibre concrete applications in Germany only.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00