Recycled carbon fibers in cement-based composites: Influence of epoxide matrix depolymerization degree on interfacial interactions

Research output: Contribution to journalResearch articleContributedpeer-review



The use of recycled carbon fibers (rCFs) in cement composites is beneficial regarding strength improvements and environmental aspects. In this paper, we present the addition of carbon fibers recovered from reinforced epoxides using hydrogen peroxide (H2O2) to cement-based composites. Two degrees of depolymerization were investigated regarding the physiochemical properties of the fibers and the interfacial interactions. Although regained CFs exhibited a smaller amount of oxygen-containing groups on the surface than virgin CF (vCF), they exhibit better adhesion and pullout resistance, as proved in single-fiber pullout tests from a cementitious matrix. The subsequent incorporation of recovered CFs into cement-based composites resulted in a pronounced increase in flexural and compressive strengths compared with the plain matrices and the cement reinforced with virgin CFs. Furthermore, the rCFs with a higher degree of depolymerization showed a better interfacial interaction toward cement matrices and hence also a better reinforcing effect.


Original languageEnglish
Article number137235
Number of pages13
JournalJournal of cleaner production
Publication statusPublished - 20 Jul 2023

External IDs

WOS 000999079800001


Research priority areas of TU Dresden

Subject groups, research areas, subject areas according to Destatis


  • Carbon fibers, Cement-based composites, Depolymerization, Epoxide, Interfacial properties, Recycling, Reinforcement, Cement -based composites