The corrosion resistance of concrete strengthened with three types of fibre-reinforced polymer (FRP) sheets (unidirectional carbon-FRP (CFRP), unidirectional basalt-FRP (BFRP) and bidirectional BFRP) was evaluated under chloride attack and the combined attack of chloride and ultraviolet radiation. After different corrosion durations, powder samples were collected from various depths of the concrete specimens to measure the total chloride ion concentrations (CICs). Scanning electron microscopy (SEM) was conducted to analyse the microscale morphology changes of the concrete surface layer, FRP fibre layer and resin matrix layer before and after combined attack. The results showed that all three types of FRP sheet provided significant chloride ion resistance, with the barrier effect of CFRP being better than that of BFRP under the same conditions. The total CIC of the FRP-strengthened concretes was higher under the combined attack than under chloride attack alone. The SEM observations showed that the resin matrix and fibre filaments of the FRP layer under combined attack were damaged, resulting in an increase in the permeability of the FRP-strengthened concretes. Finally, a time-varying model of CIC inside the FRP-strengthened concrete under chloride attack was established.

中文翻译：

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用纤维增强聚合物片增强的混凝土的耐腐蚀性

在氯化物侵蚀和氯化物和氯化物的联合侵蚀下评估了用三种类型的纤维增强聚合物 (FRP) 片材（单向碳-FRP (CFRP)、单向玄武岩-FRP (BFRP) 和双向 BFRP）加固的混凝土的耐腐蚀性能。紫外线辐射。在不同的腐蚀持续时间后，从混凝土试件的不同深度收集粉末样品以测量总氯离子浓度 (CIC)。采用扫描电镜(SEM)分析了复合侵蚀前后混凝土表层、FRP纤维层和树脂基体层的微观形貌变化。结果表明，三种类型的FRP片材均具有显着的抗氯离子性能，在同等条件下，CFRP的阻隔效果优于BFRP。FRP 增强混凝土的总 CIC 在联合侵蚀下高于单独在氯化物侵蚀下。SEM观察表明FRP层的树脂基体和纤维丝在复合攻击下受到破坏，导致FRP增强混凝土的渗透性增加。最后，建立了氯离子侵蚀下 FRP 增强混凝土内部 CIC 的时变模型。