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首页> 外文期刊>Journal of Composites for Construction >Durability of GFRP Bars' Bond to Concrete under Different Loading and Environmental Conditions
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Durability of GFRP Bars' Bond to Concrete under Different Loading and Environmental Conditions

机译：GFRP筋与混凝土的粘结在不同载荷和环境条件下的耐久性

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In the last decade, noncorrodible fiber-reinforced polymer (FRP) reinforcing bars have been increasingly used as the main reinforcement for concrete structures in harsh environments. Also, owing to their lower cost compared with other types of FRP bars, glass-FRP (GFRP) bars are more attractive to the construction industry, especially for implementation in bridge deck slabs. In North America, bridge deck slabs are exposed to severe environmental conditions, such as freeze-thaw action, in addition to traffic fatigue loads. Although the bond strength of GFRP bars has been proved to be satisfactory, their durability performance under the dual effects of fatigue-type loading and freeze-thaw action is still not well understood. Few experimental test data are available on the bond characteristics of FRP bars in concrete elements under different loading and environmental conditions. This research investigates the individual and combined effects of freeze-thaw cycles along with sustained axial load and fatigue loading on the bond characteristics of GFRP bars embedded in concrete. An FRP-reinforced concrete specimen was developed to apply axial-tension fatigue or sustained loads to GFRP bars within a concrete environment. A total of thirty-six test specimens was constructed and tested. The test parameters included bar diameter, concrete cover thickness, loading scheme, and environmental conditioning. After conditioning, each specimen was sectioned into two halves for pullout testing. Test results showed that fatigue load cycles resulted in approximately 50% loss in the bond strength of sand-coated GFRP bars to concrete, while freeze-thaw cycles enhanced their bond to concrete by approximately 40%. Larger concrete covers were found more important in cases of larger bar sizes simultaneously subjected to fatigue load and freeze-thaw cycles.
机译：在过去的十年中，不可腐蚀的纤维增强聚合物（FRP）钢筋越来越多地用作恶劣环境下混凝土结构的主要增强材料。同样，由于玻璃纤维增​​强筋（GFRP）与其他类型的玻璃纤维增​​强筋相比成本更低，因此对建筑行业更具吸引力，尤其是在桥面板中。在北美，除了交通疲劳负荷外，桥面板平板还承受严酷的环境条件，例如冻融作用。尽管已证明GFRP筋的粘结强度令人满意，但在疲劳型加载和冻融作用的双重作用下其耐久性能仍未得到很好的理解。关于在不同载荷和环境条件下混凝土构件中的FRP筋粘结特性的实验研究数据很少。这项研究调查了冻融循环以及持续的轴向载荷和疲劳载荷对嵌入混凝土的GFRP筋粘结特性的个体和综合影响。开发了FRP增强的混凝土标本，以在混凝土环境中向GFRP钢筋施加轴向张力疲劳或持续载荷。总共构建并测试了36个测试样本。测试参数包括钢筋直径，混凝土覆盖层厚度，荷载方案和环境条件。调节后，将每个样品切成两半进行拉出测试。测试结果表明，疲劳载荷循环导致砂涂GFRP筋与混凝土的粘结强度损失约50％，而冻融循环将其与混凝土的粘结强度提高约40％。人们发现，较大的钢筋同时承受疲劳载荷和冻融循环时，较大的混凝土覆盖层更为重要。

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