CFRP 和含有 MWCNT 的 GFRP 承压混凝土圆柱体在暴露于各种侵蚀性环境后的轴向抗压行为

IF 3 Q2 MATERIALS SCIENCE, COMPOSITES
Sruthi Sreekumar Kavitha, Mini K. Madhavan, K. Jayanarayanan, P. Sarker
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引用次数: 0

摘要

纤维增强聚合物约束被认为是改造混凝土结构的有效方法。目前的研究探讨了单层和双层碳纤维增强聚合物(CFRP)以及多壁碳纳米管(MWCNT)与三层玻璃纤维增强聚合物(GFRP)在混凝土圆柱体上的约束在侵蚀性暴露(如酸、碱、海洋、水和高温)下的有效性。按环氧树脂基体重量计,MWCNT 的含量为 1 wt.%,层压板的机械特性得到显著改善。在酸暴露的情况下,单层 CFRP 约束的混凝土试样的轴向承载能力与掺入了 MWCNT 的三层 GFRP 约束(GF3C1-AC)的混凝土试样的轴向承载能力相当。与单层和双层 CFRP 约束相比,GF3C1-AC 的轴向应变分别高出 23% 和 12%。在 400 °C 下暴露后,与单层和双层 CFRP 约束相比,加入了 MWCNT 的三层 GFRP 约束试样的轴向应变分别增加了 50%和 20%,这证明了 MWCNT 作为耐热纳米填料的功效。超声波脉冲速度(UPV)测试表明,约束系统通过阻碍裂缝扩展来保护混凝土核心免受突然破坏。测试结果证明,在恶劣的环境条件下,添加了 MWCNT 的玻璃钢系统可被视为 CFRP 系统的未来替代品。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Axial Compressive Behavior of CFRP and MWCNT Incorporated GFRP Confined Concrete Cylinders after Exposure to Various Aggressive Environments
Fiber-reinforced polymer confinement is considered to be effective in the retrofitting of concrete structures. The current study explores the effectiveness of one- and two-layer carbon fiber reinforced polymer (CFRP) and multiwalled carbon nanotube (MWCNT) incorporated three-layer glass fiber reinforced polymer (GFRP) confinement on concrete cylinders under aggressive exposures, such as acid, alkaline, marine, water, and elevated temperatures. At 1 wt.% MWCNT by weight of the epoxy matrix, mechanical characteristics of the laminate show a significant improvement. In the case of acid exposure, the axial load-carrying capacity of concrete specimens with single-layer CFRP confinement was equal to that of MWCNT incorporated three-layer GFRP confinement (GF3C1-AC). The axial strain of GF3C1-AC was 23% and 12% higher than one and two-layer CFRP confinement. After exposure at 400 °C, in comparison with one- and two-layer CFRP confinement, the axial strain of MWCNT incorporated three-layer GFRP confined specimens increased by 50% and 20%, respectively, which proved the efficacy of MWCNT as a heat-resistant nanofiller. The ultrasonic pulse velocity (UPV) test indicates that the confinement system protects the concrete core from sudden failure by impeding crack propagation. The test results proved that the MWCNT incorporated FRP system can be considered as a prospective substitute for CFRP systems for retrofitting applications in severe environmental conditions.
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来源期刊
Journal of Composites Science
Journal of Composites Science MATERIALS SCIENCE, COMPOSITES-
CiteScore
5.00
自引率
9.10%
发文量
328
审稿时长
11 weeks
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