Using fibre reinforced polymer (FRP) composites together with seawater and sea sand concrete (SWSSC) in coastal areas will overcome the environmental issues of using ordinary concrete and corrosion problems of conventional steel reinforcements. The present research investigates the mechanical properties of different SWSSC filled FRP tubes after exposure to seawater. Glass, carbon, and basalt filament wound FRP tubes were filled with SWSSC and exposed to seawater for different exposure durations at different temperatures. A total number of 567 Hoop tension and compression tests were carried out after conditioning to investigate the mechanical properties degradation of the tubes. In addition, scanning electron microscopy (SEM) and micro computed tomography (micro-CT) analyses were conducted on representative samples to study the degradation mechanisms and damage progression. Finally, the long-term mechanical performance of SWSSC filled tubes under seawater was predicted based on Arrhenius theory and using the experimental data. According to the test data, generally, the samples with multiple fibres direction showed better durability compared to the tubes with fibres oriented in hoop directions. Moreover, carbon tubes experienced the smallest degradation while glass and basalt tubes showed almost the same range of degradation.

在沿海地区使用纤维增强聚合物（FRP）复合材料以及海水和海砂混凝土（SWSSC）将克服使用普通混凝土的环境问题和常规钢增强材料的腐蚀问题。本研究调查了不同的SWSSC填充的FRP管在暴露于海水后的力学性能。将玻璃纤维，碳纤维和玄武岩长丝缠绕的FRP管装满SWSSC，并在不同温度下以不同的暴露时间暴露在海水中。调理后进行了总共567次环箍拉伸和压缩测试，以研究管材的机械性能退化。此外，对代表性样品进行了扫描电子显微镜（SEM）和微型计算机断层扫描（micro-CT）分析，以研究其降解机理和破坏进程。最后，根据Arrhenius理论并利用实验数据，对SWSSC填充管在海水中的长期力学性能进行了预测。根据测试数据，通常，与具有沿环向取向的纤维的试管相比，具有多纤维方向的样品具有更好的耐久性。此外，碳管的降解最小，而玻璃管和玄武岩管的降解范围几乎相同。通常，与具有沿环向定向的纤维的试管相比，具有多纤维方向的样品具有更好的耐久性。此外，碳管的降解最小，而玻璃管和玄武岩管的降解范围几乎相同。通常，与具有沿环向定向的纤维的试管相比，具有多纤维方向的样品具有更好的耐久性。此外，碳管的降解最小，而玻璃管和玄武岩管的降解范围几乎相同。