Investigation of pull-out and mechanical performance of fibre reinforced concrete with recycled carbon fibres

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-09-17 DOI:10.1617/s11527-024-02453-4

Vanessa Overhage, Kira Heins, Magdalena Kimm, Gum-Sung Ryu, Young-Jun You, Hyeong-Yeol Kim, Thomas Gries

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Abstract

This paper presents the pull-out bonding behaviour and mechanical performance of recycled carbon fibre (rCF) reinforced concrete based on the recent investigation of fibre reinforced concrete (FRC) with rCF recovered from pyrolysis. Single fibre pull-out tests have been carried out to identify the apparent interfacial shear strength of different types of rCF and virgin carbon fibre (vCF) to identify the fibre matrix connection. Furthermore, a series of tests have been carried out to identify the workability, compressive strength and tensile strength of FRC. Besides rCF, also vCF and steel fibre were used for fabrication of FRC test specimens. rCF have shown the same adhesion behaviour and strength like vCF. Furthermore, the use of unsized or acrylate-based sized rCF creates an adhesion between fibre and matrix material. During the pull-out tests, the failure does not occur as an adhesive crack between fibre and cement matrix, but as a cohesive crack in the cement matrix. The mechanical performance of FRC with rCF was compared with mortar and FRC with vCF and steel fibres. The results of compressive test conducted for FRC with vCF and rCF indicated that the influence of vCF and rCF on the compressive strength of FRC was insignificant. On the other hand, the results of tensile test conducted for FRC with vCF and rCF indicated that the tensile strength of FRC with rCF was at least 14.9% greater than that of FRC with vCF.

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使用回收碳纤维的纤维加固混凝土的抗拔和机械性能研究

本文介绍了再生碳纤维（rCF）加固混凝土的拉拔粘结行为和机械性能，其基础是最近对使用热解回收的 rCF 进行纤维加固混凝土（FRC）的研究。我们进行了单纤维拉出试验，以确定不同类型 rCF 和原碳纤维（vCF）的表观界面剪切强度，从而确定纤维基体连接。此外，还进行了一系列测试，以确定 FRC 的可加工性、抗压强度和抗拉强度。除了 rCF 外，还使用了 vCF 和钢纤维来制作 FRC 测试试样。此外，使用无尺寸或丙烯酸酯尺寸的 rCF 还能在纤维和基体材料之间产生粘附力。在拉拔试验中，纤维与水泥基体之间的破坏并不表现为粘合裂缝，而是水泥基体中的内聚裂缝。含 rCF 的 FRC 的机械性能与砂浆以及含 vCF 和钢纤维的 FRC 进行了比较。对含有 vCF 和 rCF 的 FRC 进行的抗压试验结果表明，vCF 和 rCF 对 FRC 抗压强度的影响不大。另一方面，对含有 vCF 和 rCF 的泡沫塑料混凝土进行拉伸试验的结果表明，含有 rCF 的泡沫塑料混凝土的拉伸强度比含有 vCF 的泡沫塑料混凝土高至少 14.9%。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.