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首页> 外文期刊>Journal of Composites for Construction >Oxygen Permeability of Fiber-Reinforced Polymers
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Oxygen Permeability of Fiber-Reinforced Polymers

机译：纤维增强聚合物的透氧性

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摘要

Several independent studies have confirmed that fiber-reinforced polymers (FRP) used for repairing corrosion-damaged concrete structures slow down the corrosion rate. This suggests that in this application, FRP serves as a barrier to the ingress of moisture and oxygen that are critically important for sustaining electrochemical corrosion of steel in concrete. Because oxygen molecules are smaller than both water and chloride molecules, they diffuse faster. Therefore, their permeation through FRP is more critical. This paper presents results from an experimental study that determined the oxygen permeability of FRP laminates. Four different commercially available carbon-fiber-reinforced polymer (CFRP) and glass-fiber-reinforced polymer (GFRP) systems were investigated, and four different fiber orientations were evaluated for one-layer and two-layer configurations. The results showed that the oxygen permeability of FRP was somewhat poorer than the epoxy used for its fabrication. Single-layer FRP laminates were less permeable than two-layer laminates, a finding that had previously been reported but considered anomalous. Scanning electron micrographs indicated that this could be attributed to voids between the layers. The nonzero oxygen permeability of FRP explains why it can slow down but cannot completely stop chloride-induced corrosion of concrete.
机译：几项独立研究证实，用于修复腐蚀损坏的混凝土结构的纤维增强聚合物（FRP）减缓了腐蚀速率。这表明在该应用中，FRP可以阻止水分和氧气的进入，这对于维持混凝土中钢的电化学腐蚀至关重要。因为氧分子比水和氯分子都小，所以它们扩散得更快。因此，它们通过FRP的渗透更为关键。本文介绍了确定FRP层压板的透氧性的实验研究结果。研究了四种不同的市售碳纤维增强聚合物（CFRP）和玻璃纤维增​​强聚合物（GFRP）系统，并对四种不同的纤维取向进行了一层和两层配置评估。结果表明，FRP的透氧性比其制造中使用的环氧树脂差。单层FRP层压板的渗透性不如两层层压板，这一发现先前已经报道过，但被认为是异常的。扫描电子显微照片表明，这可能归因于各层之间的空隙。 FRP的非零氧气渗透率解释了为什么它可以减慢速度，但不能完全阻止氯化物引起的混凝土腐蚀。

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