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

  • 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 reinforcingThe 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.show moreshow less

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Metadaten
Author:Huanyu LiORCiD, Elisabeth Schamel, Marco LiebscherORCiD, Yupeng Zhang, Qingyi Fan, Herbert Schlachter, Thomas Köberle, Viktor Mechtcherine, Gerd Wehnert, Dominik Söthje
DOI:https://doi.org/10.1016/j.jclepro.2023.137235
ISSN:0959-6526
Parent Title (English):Journal of Cleaner Production
Publisher:Elsevier BV
Document Type:Article
Language:English
Date of first Publication:2023/07/20
Reviewed:Begutachtet/Reviewed
Contributing Corporation:Technische Universität Dresden
Release Date:2024/06/10
Tag:Cabon Fibers; Cement-based Composites; Recyling
Volume:411
Article Number:137235
Pagenumber:13
First Page:2
Last Page:13
Research Themes:Materialien & Produktionstechnik
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