Bond Strength of Post-installed Anchor Adhering to Damaged Concrete by Freeze-thaw Action

IF 1.6 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Advanced Concrete Technology Pub Date : 2024-04-03 DOI:10.3151/jact.22.178

Yuga Yano, Taito Shiokoshi, Yuya Takase, Yutaro Ishida, Takahide Abe, Muneomi Takahashi, Tsutomu Ishigaki

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引用次数: 0

Abstract

Reinforced concrete (RC) structures in cold regions are susceptible to surface deterioration due to freeze-thaw cycles (FTC). For sustainable development goals (SDGs) and a decarbonized society, damaged structures should be repaired and reinforced. Post-installed anchors are commonly used for seismic retrofitting and equipment fixation. However, research on the bond characteristics of damaged concrete is limited. Therefore, in this study, the bonding performance of adhesive anchors in damaged concrete was investigated. Liquid nitrogen was employed to subject the concrete surface to FTC; subsequently, bond-slip tests were conducted with the degree of deterioration serving as a parameter. The results suggested, the bond strength decreased as the degree of damage increased. The reduction ratios of the post-installed anchor with epoxy and cement-based resins were almost identical. Furthermore, a bond strength equation was proposed by referring to the bond-slip model between the rebar and concrete (fib 1990). The test results were well predicted with a correlation coefficient of 0.94. This study is based on previous studies (Yano et al. 2022, 2023) but presents new findings.

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冻融作用下后置锚固件与受损混凝土的粘结强度

寒冷地区的钢筋混凝土（RC）结构很容易因冻融循环（FTC）而导致表面老化。为了实现可持续发展目标（SDGs）和去碳化社会，应修复和加固受损结构。后安装锚栓通常用于抗震改造和设备固定。然而，对受损混凝土粘结特性的研究却十分有限。因此，本研究调查了粘合锚栓在受损混凝土中的粘合性能。采用液氮对混凝土表面进行 FTC，然后以劣化程度为参数进行粘结滑动测试。结果表明，粘接强度随着损坏程度的增加而降低。使用环氧树脂和水泥基树脂的后安装锚固件的降低率几乎相同。此外，参照钢筋和混凝土之间的粘结滑移模型（fib，1990 年），提出了一个粘结强度方程。测试结果的预测结果良好，相关系数为 0.94。本研究基于之前的研究（Yano 等人，2022 年、2023 年），但提出了新的发现。

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

期刊介绍： JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics