Stress-strain behaviour of carbon fibre reinforced polymer-confined concrete containing macro fibres recycled from waste glass fibre reinforced polymer

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Advances in Structural Engineering Pub Date : 2024-03-28 DOI:10.1177/13694332241242983
Qi-Qi Zou, Bing Fu, Jian-Fei Chen, Jin-Guang Teng
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Abstract

Glass fibre-reinforced polymer (GFRP) wastes may be mechanically processed into small strips called “macro fibres,” which were used as short reinforcement fibres to produce macro fibre reinforced concrete (MFRC). The addition of such macro fibres into concrete has proven to be effective in enhancing the flexural strength and toughness of concrete, but it also slightly reduces the compressive strength of concrete. This paper presents a study on the behaviour of CFRP-confined MFRC. A total of 84 CFRP-confined MFRC cylinders were prepared and tested in axial compression. The test parameters included the CFRP confinement stiffness, macro fibre content, and fibre length. The test results show that the compressive strength and ultimate axial strain can be significantly enhanced through the use of CFRP confinement. The ultimate axial strain of CFRP-confined concrete with macro fibres is slightly higher than that without macro fibres. The test results were compared with two well-known stress-strain models for FRP-confined concrete, including Teng et al.’s design-oriented model and Jiang and Teng’s analysis-oriented model. A comparative analysis showed that both models slightly underestimate the compressive strength and slightly overestimate the ultimate axial strain for CFRP-confined MFRC.
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含有从废玻璃纤维增强聚合物中回收的大纤维的碳纤维增强聚合物密实混凝土的应力-应变行为
玻璃纤维增强聚合物(GFRP)废料可通过机械方法加工成称为 "大纤维 "的小条,用作生产大纤维增强混凝土(MFRC)的短增强纤维。事实证明,在混凝土中加入这种大纤维可有效提高混凝土的抗折强度和韧性,但也会略微降低混凝土的抗压强度。本文对 CFRP 密实 MFRC 的行为进行了研究。共制备了 84 个 CFRP 密实 MFRC 筒体,并进行了轴向压缩测试。测试参数包括 CFRP 约束刚度、宏观纤维含量和纤维长度。试验结果表明,使用 CFRP 约束材料可以显著提高抗压强度和极限轴向应变。含有大纤维的 CFRP 混凝土的极限轴向应变略高于不含大纤维的混凝土。试验结果与两个著名的玻璃钢约束混凝土应力应变模型进行了比较,包括 Teng 等人的设计导向模型以及 Jiang 和 Teng 的分析导向模型。对比分析表明,两种模型都略微低估了 CFRP 密实 MFRC 的抗压强度,略微高估了其极限轴向应变。
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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