海洋环境下FRP筋海砂混凝土结构性能劣化机理及其耐久性计算研究

易腐蚀的钢材和日益枯竭的河砂资源无法高效支撑海洋工程的快速发展，将耐腐蚀纤维增强复合材料（FRP）筋与储量丰富的海砂组合使用可为上述问题的解决提供一条理想途径，但目前对该新型组合形式的长期耐久性能还认识不清。为突破这一瓶颈，本项目采取短期加速-自然暴露一体化耐久性试验研究和预测分析研究相结合的方法，力求揭示FRP筋海砂混凝土结构在海洋环境下的微细观劣化机理，并建立基于海洋腐蚀环境分区理念的耐久性计算方法。研究聚焦于三个方面：1）海洋环境下FRP筋海砂混凝土结构性能退化规律及劣化机理试验研究；2）考虑“多因素”影响的FRP筋及其与海砂混凝土黏结长期性能精准预测模型研究；3）基于海洋腐蚀环境分区理念的FRP筋海砂混凝土结构耐久性计算研究。项目研究成果可为FRP筋海砂混凝土新结构形式的加速应用和世界海洋基础设施耐腐蚀性能的提升做出贡献。

Corrodible steels and increasingly depleted river sand resources cannot efficiently support the rapid development of marine engineering. The combination of corrosion-resistant fiber reinforced composite (FRP) bars and abundant sea sands can provide an ideal solution to the above problem. However, the long-term durability of this new combination is still unclear. To break this bottleneck, Durability tests combining short-term acceleration with natural exposure, and predictive analysis are adopted in this project. The aim is to reveal the microscopic degradation mechanism of FRP bars reinforced sea-sand concrete structures in the marine environment and to establish a durability calculation method based on the marine corrosion environment zoning concept. The research focuses on three aspects: 1) Experimental study on the degradation law and the deterioration mechanism of FRP bars reinforced sea-sand concrete structure in the marine environment; 2) Research on the accurate long-term performance prediction model of FRP bar itself and its bond with sea-sand concrete considering the influence of “multi-factor”; 3) Study on the durability calculation of FRP bars reinforced sea-sand concrete structure based on the marine corrosion environment zoning concept. The research results of this project can contribute to the accelerated application of the new FRP bars reinforced sea-sand concrete structure and the improvement of the corrosion resistance of the world's marine infrastructure.