中文摘要：

为了研究海洋潮汐环境下聚丙烯纤维混凝土中氯离子迁移规律，采用干湿交替方式模拟海洋潮汐环境，分析纤维混凝土的氯离子含量分布及微观结构。结果表明，试件表面氯离子富集区随干湿交替次数增加而向内迁移；氯离子结合能力随深度增加呈先增大再减小后增大的趋势；氯离子扩散系数随干湿交替次数增加而减小，相应试件中氯离子扩散系数在相同干湿循环次数后表现出相似的变化趋势；纤维掺量为0．1％的试件内部致密，随纤维掺量继续增大，试件的抗氯离子侵蚀能力减弱。

英文摘要：

In order to study the durability performance of Polypropylene fiber （PPF） concrete exposed to sea tidal zone, the dry-wet cycle is used to simulate sea tidal environment.The chloride ion concentration distribution and microstructure are analyzed.The results show that the chloride enrichment region of the specimen surface migrates inward with the increase of cycle times.With the increase of depth, the content of binding chloride first increases and then decreases, finally increases.The chloride ion diffusion coefficient decreases with the increase of times of dry-wet cycles, and shows the similar trend after the same number of dry-wet cycles.The specimen with 0.1% fiber content has dense microstructure, with the increase of fiber content, the chloride ion erosion resistance of the specimens is weaken.