TY - JOUR A1 - Li, Huanyu A1 - Schamel, Elisabeth A1 - Liebscher, Marco A1 - Zhang, Yupeng A1 - Fan, Qingyi A1 - Schlachter, Herbert A1 - Köberle, Thomas A1 - Mechtcherine, Viktor A1 - Wehnert, Gerd A1 - Söthje, Dominik T1 - Recycled carbon fibers in cement-based composites: Influence of epoxide matrix depolymerization degree on interfacial interactions JF - Journal of Cleaner Production N2 - 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 depolymer-ization showed a better interfacial interaction toward cement matrices and hence also a better reinforcing effect. KW - Recyling KW - Cabon Fibers KW - Cement-based Composites Y1 - 2023 U6 - https://doi.org/10.1016/j.jclepro.2023.137235 SN - 0959-6526 VL - 411 SP - 2 EP - 13 PB - Elsevier BV ER -