Concrete with a High Content of End-of-Life Tire Materials for Flexural Strengthening of Reinforced Concrete Structures

Thomaida Polydorou, Nicholas Kyriakides, Andreas Lampropoulos, Kyriacos Neocleous, Renos Votsis, Ourania Tsioulou, Kypros Pilakoutas, Diofantos Hadjimitsis

Research output: Contribution to journalArticlepeer-review


This research investigates the performance of Steel Fiber Reinforced Rubberized Concrete (SFRRC) that incorporates high volumes of End-of-life tire materials, (i.e., both rubber particles and recycled tire steel fibers) in strengthening existing reinforced concrete (RC) beams. The mechanical and durability properties were determined for an environmentally friendly SFRRC mixture that incorporates a large volume (60% by volume aggregate replacement) of rubber particles and is solely reinforced by recycled tire steel fibers. The material was assessed experimentally under flexural, compressive and impact loading, and thus results led to the development of a numerical model using the Finite Element Method. Furthermore, a numerical study on full-scale structural members was conducted, focusing on conventional RC beams strengthened with SFRRC layers. This research presents the first study where SFRRC is examined for structural strengthening of existing RC beams, aiming to enable the use of such novel materials in structural applications. The results were compared to respective results of beams strengthened with conventional RC layers. The study reveals that incorporation of End-of-life tire materials in concrete not only serves the purpose of recycling End-of-life tire products, but can also contribute to unique properties such as energy dissipation not attained by conventional concrete and therefore leading to superior performance as flexural strengthening material. It was found that by incorporating 60% by volume rubber particles in combination with recycled steel fibers, it increased the damping ratio of concrete by 75.4%. Furthermore, SFRRC was proven effective in enhancing the energy dissipation of existing structural members
Original languageEnglish
Article number6150
Pages (from-to)1-21
Number of pages21
Issue number17
Publication statusPublished - 5 Sept 2022

Bibliographical note

Funding Information:
This research was funded by the Startup Grant for Nicholas Kyriakides, through the Cyprus University of Technology Internal Fund 3/319 and the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Individual Fellowship (MSCA-IF) grant agreement No. 748600.

Publisher Copyright:
© 2022 by the authors.


  • Rubberized concrete
  • Recycled steel fibers
  • Rubber aggregate
  • End-of-life Tire Materials
  • Strengthening


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