基于多尺度填料协同改性环氧树脂的混凝土表面防护层构筑及其海洋浪溅区防护机理研究

With the proposing strategic policy of building China into a maritime power, the offshore facilities represented by concrete structures have developed rapidly. Meanwhile, there are also several problems such as premature failure and poor durability for the reinforced concretes exposed to harsh marine environment for a long time. Construction the surface protective coating for marine engineering facilities using reinforced epoxy resin has some advantages, such as good corrosion resistance, simple construction process and low cost. In view of the present lack of thorough and systematic researches on the complex and hash condition in the splash zone, studies are to be carried out by means of field investigation, performance test and model derivation, which considering the characteristics such as salt spray corrosion, wave impact, sediment abrasion and dry-wet cycles. It is expected to obtain the best formula of protective coating construction, reveal the mechanism of the synergistic effect of multi-scale fillers on the performance of epoxy protective coating, expound the failure mechanism of the protective coating under multi-field coupling condition, and prediction of service life of it. The expected research results can provide technical support to the durability improvement and life design of marine engineering facilities.

随着我国建设海洋强国战略方针的提出，以钢筋混凝土结构为代表的海洋工程设施得到了快速发展，同时，其长期暴露在恶劣的海洋环境中也存在过早失效、耐久性差等问题，其中以海洋浪溅区最为严重。采用改性环氧树脂构筑的防护层具有耐腐蚀性能好、施工工艺简单、成本低廉等优点。针对海洋浪溅区条件下钢筋混凝土材料工况严酷复杂、且该条件下环氧防护层的防护机理尚未开展深入系统研究的现状，采用现场调研、性能试验及模型推导等手段，综合考虑盐雾腐蚀、海浪冲击、泥沙磨损、干湿循环的共同作用对防护层失效行为的影响，开展基于多尺度填料协同改性环氧树脂的混凝土防护层构筑及其海洋浪溅区防护机理研究，获得防护层构筑的最佳配方，揭示多尺度填料协同对环氧防护层性能的提升机理，阐明多场耦合作用下防护层的失效机理，实现防护层服役寿命的预测。项目预期成果将为海洋工程中混凝土设施的耐久性提升与寿命设计提供技术支撑。

海洋环境中的钢筋混凝土结构因长期暴露在恶劣环境下往往存在过早失效、耐久性差等问题，其中以浪溅区最为严重，开展混凝土表面复合防护层构筑及其防护机理研究，对在役和新建混凝土结构具有重要的现实意义。课题组通过多尺度填料协同改性环氧树脂的技术途径，优化了多尺度填料表面预处理工艺参数，在混凝土表面构筑了一种基于微米级短切纤维、氧化石墨烯和纳米二氧化硅的多尺度填料协同改性复合防护层，开展了其抗冲击、摩擦磨损、涂层表面附着力、动态热机械性能、拉伸性能、耐腐蚀性能等实验，系统阐明了多尺度填料对环氧防护层的强韧机制，发现了多尺度填料共同作用对环氧防护层性能提升的协同效应，揭示了复合防护层在恶劣服役环境中的失效机理，建立了防护层服役寿命预测理论模型。相关研究成果可为在役和新建海工混凝土结构的耐久性提升提供基础理论和关键技术支撑。