To investigate the effects of wet–heat–salt coupling environment (WHSCE) and the content of polyvinyl alcohol (PVA) fibers on the durability of cementitious composites (CC), a series of durability tests were carried out. In this study, the salt concentration in the WHSCE was set to 5%, the temperature at 50°C, and the relative humidity at 100%. Six different contents of PVA fibers were set up in the test for exploring their effects on the durability (impermeability, chloride ion penetration resistance, freeze–thaw resistance, and chloride salt erosion resistance under dry and wet cycle conditions) of CC. The results showed that durability of CC under the WHSCE was enhanced regardless of the content of PVA fibers added. At the PVA fiber amount of 1.2%, the impermeability pressure, electric flux, mass loss rate, compressive strength loss rate, and compressive strength corrosion resistance coefficient under the WHSCE reached the optimal values. This indicated that the durability of CC was most favorable when the amount of PVA fibers was 1.2% since many engineering structures are subject to erosion by various factors in the ocean, which can inevitably affect the service life of the purchase. In this study, the effect of PVA fiber content on the durability of CC in complex environment is studied, which provides experimental data and analytical ideas for improving engineering located in the ocean, hoping to provide a theoretical basis for their subsequent application in practical engineering.

中文翻译：

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PVA纤维对湿-热-盐耦合环境下水泥基复合材料耐久性的影响


为了研究湿热盐耦合环境（WHSCE）和聚乙烯醇（PVA）纤维含量对水泥基复合材料（CC）耐久性的影响，进行了一系列耐久性试验。在本研究中，WHSCE 中的盐浓度设置为 5%，温度设置为 50°C，相对湿度设置为 100%。试验中设置了6种不同含量的PVA纤维，探讨其对CC耐久性（抗渗性、抗氯离子渗透性、抗冻融性、干湿循环条件下抗氯盐侵蚀性）的影响。结果表明，无论添加的 PVA 纤维含量如何，CC 在 WHSCE 下的耐久性都会增强。当PVA纤维用量为1.2%时，WHSCE下的抗渗压力、电通量、质量损失率、抗压强度损失率和抗压强度耐腐蚀性系数均达到最佳值。这表明，当PVA纤维的用量为1.2%时，CC的耐久性最为有利，因为许多工程结构会受到海洋中各种因素的侵蚀，这不可避免地会影响购买的使用寿命。本研究研究了PVA纤维含量对CC在复杂环境下耐久性的影响，为改善位于海洋的工程提供了实验数据和分析思路，希望为其后续在实际工程中的应用提供理论依据。