不同界面处理的GFRP混合混凝土梁在潮湿环境下的耐久性和弯曲性能

IF 6.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Tuna Ülger, Murat Cavuslu
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引用次数: 0

摘要

本研究对潮湿环境下混凝土-混杂玻璃纤维增强聚合物(CF-GFRP)梁的长期弯曲行为和界面剪切破坏机制进行了实验研究。该研究主要集中在提高混凝土-玻璃钢界面的粘结效率,使用不同的表面处理技术,旨在改善荷载传递和减轻过早剥离。通过实验室测试,对组成材料(包括混凝土、GFRP型材和粘合粘合剂)的机械性能进行了全面表征。对参考GFRP箱梁和4个混合梁试件进行了一系列三点弯曲试验,每个试件都采用了独特的表面处理策略:自然粘结(未处理)、颗粒涂层、环氧粘合剂和机械紧固。评估了短期性能(30天养护后)和长期耐久性(暴露在不受控制的室外条件下两年)。研究结果表明,除了自然粘结的试件外,随着时间的推移,梁保留了很大一部分其抗弯能力,仅观察到适度的降低。在所有构型中,环氧树脂粘结梁的初始抗弯强度最高;然而,在环境暴露下,它也显示出最大的性能下降,突出了环境耐久性对粘合界面的关键影响。对裂缝萌生、扩展和最终破坏模式的详细观察强调了优化表面制备和机械联锁在促进CF-GFRP梁结构完整性和长期使用能力方面的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Durability and flexural behavior of concrete-filled hybrid GFRP beams with various interface treatments under humid environmental exposure
This study presents an experimental investigation into the long-term flexural behavior and interface shear failure mechanisms of Concrete-Filled Hybrid Glass Fiber Reinforced Polymer (CF-GFRP) beams exposed to humid environmental conditions. The research primarily focuses on enhancing the bond efficiency at the concrete–GFRP interface using different surface treatment techniques aimed at improving load transfer and mitigating premature debonding. The mechanical properties of the constituent materials - including concrete, GFRP profiles, and bonding adhesives—were comprehensively characterized through laboratory testing. A series of three-point bending tests were conducted on a reference GFRP box beam and four hybrid beam specimens, each incorporating a unique surface treatment strategy: natural bonding (untreated), granular coating, epoxy adhesive, and mechanical fastening. Both short-term performance (after 30 days of curing) and long-term durability (following two years of exposure to uncontrolled outdoor conditions) were assessed. The findings revealed that, except for the naturally bonded specimens, the beams retained a significant portion of their flexural capacity over time, with only moderate reductions observed. Among all configurations, the epoxy-bonded beam exhibited the highest initial flexural strength; however, it also demonstrated the greatest performance degradation under environmental exposure, highlighting the critical influence of environmental durability on bonded interfaces. Detailed observations of crack initiation, propagation, and final failure modes emphasized the importance of optimized surface preparation and mechanical interlocking in promoting structural integrity and long-term serviceability of CF-GFRP beams.
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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