Assessment on Bond Strength of CFRP Sheet Bonded to Concrete Focused on Sheet Stiffness

IF 1.6 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-04-05 DOI:10.3151/jact.22.190

Mitsuhiko Ozaki, Yasuhiko Sato, Eiji Yoshida, Aya Takeuchi, Yuta Yamada, Fumiaki Nagashima

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Abstract

In previous studies on the bond behaviors of FRP sheets attached to concrete, specimens for bond tests that contained FRP sheets with relatively low stiffnesses were used. However, in actual strengthening design, high stiffnesses of FRP sheets are required because the scale of the structure is very large. Therefore, in this study, bond tests were conducted using specimens with many different sheet stiffnesses and with polyurea resin. As a result, the bond strength increased as the stiffness increased with multiple CFRP sheets. Nevertheless, existing bond strength models overestimated the bond strength when the stiffness exceeded 200 kN/mm. In addition, 3D scanning measurements of patterned and indented concrete thin layers behind CFRP sheets revealed that the interfacial fracture energy was strongly related to the surface area of the concrete thin layer, not to the CFRP sheet stiffness or the resin properties.

This paper is an English translation of the authors’ previous work [Ozaki, M., Sato, Y., Yoshida, E., Takeuchi, A., Yamada, Y. and Nagashima, F., (2023). “Assessment on bond strength of CFRP sheet bonded to concrete focused on sheet stiffness.” Journal of JSCE, 79(6), 22-00289. (in Japanese)].

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以片材刚度为重点评估与混凝土粘接的 CFRP 片材的粘接强度

在以往关于附着在混凝土上的 FRP 片材的粘结行为的研究中，粘结试验中使用的试样包含刚度相对较低的 FRP 片材。然而，在实际加固设计中，由于结构的规模非常大，因此需要高刚度的 FRP 片材。因此，在本研究中，使用了多种不同刚度的板材试样和聚脲树脂进行了粘接试验。结果发现，随着多个 CFRP 片材刚度的增加，粘接强度也随之增加。然而，当刚度超过 200 kN/mm 时，现有的粘接强度模型高估了粘接强度。此外，对 CFRP 片材后面的混凝土薄层的图案和凹陷进行的三维扫描测量显示，界面断裂能与混凝土薄层的表面积密切相关，而与 CFRP 片材的刚度或树脂特性无关。"以片材刚度为重点的 CFRP 片材与混凝土粘结强度评估"。JSCE期刊，79（6），22-00289。(日文）]。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Advanced Concrete Technology 工程技术-材料科学：综合

CiteScore

3.70

自引率

10.00%

发文量

审稿时长

3.5 months

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