海工混凝土耦合加速腐蚀试验与实海服役相关性研究

Although many researches have been studied on the material system, structural design and life expectancy, decreased performance and shortened life expectancy of marine concrete in the real sea service still appear because of the imperfect field test system. Facing the actual problems of Indoor Acceleration Corrosion Test limitation and Real Sea Field Test difficulty, this project selects Zhejiang University Marine Ecological Technology Demonstration Island to explore the correlation between indoor and real sea field tests, Laying a theoretical foundation for the improvement of marine concrete field testing system. To master the influence of field tests on the marine concrete damage evolution mechanism, we will study the interaction between concrete and seawater under constant and non-constant source conditions using natural seawater, then establish the coupled corrosion evolution model based on the indoor accelerated corrosion test system, considering the multi-ion synergy impact on the chloride ion migration mechanism in concrete; Furtherly study the micro-macroscopic behavior of marine concrete under long-term real sea service, and establish the real sea corrosion evolution model based on the changes of marine environmental parameters; Explore the correlation between indoor and real sea field tests to propose the calculation method of accelerating factor of indoor accelerated corrosion test, and finally optimize the indoor accelerated corrosion test system matching the island environment in the East China Sea. Proposed to apply for ≥ 2 patents, and publish ≥ 3 SCI / EI papers.

海工混凝土材料体系、结构设计、寿命预测等已有较多研究，然而环境试验体系不完善导致实海服役后出现性能下降、寿命不足等问题。针对室内试验加速腐蚀有限和实海服役试验困难等现状，本项目选择浙江大学海洋生态科技示范岛，探究室内加速试验与实海服役关系模型，为海工混凝土环境试验体系的完善打下理论基础。为掌握环境试验对海工混凝土损伤演化机制，拟利用天然海水进行室内干湿循环加速腐蚀试验，研究恒源及非恒源条件下混凝土与海水的交互作用，并与人工海水试验对比归纳出多离子协同对混凝土氯离子迁移影响机制，建立基于加速腐蚀试验制度的耦合损伤演化模型；研究长周期实海服役下混凝土微宏观性能演变规律，并基于海洋环境参数变化建立海工混凝土实海损伤演化模型；探究室内加速试验与实海服役关系模型，提出室内模拟试验加速因子计算方式，优选出符合东海海岛环境的室内加速腐蚀试验制度。拟申请专利≥2 项、发表SCI/EI论文≥3篇。

海工混凝土材料体系、结构设计、寿命预测等已有较多研究，然而环境试验体系不完善导致实海服役后出现性能下降、寿命不足等问题。针对室内试验加速腐蚀有限和实海服役试验困难等现状，本项目选择浙江大学海洋生态科技示范岛，探究室内加速试验与实海服役关系模型，为海工混凝土环境试验体系的完善打下理论基础。.本项目利用多倍氯盐浓度浸泡和氯盐干湿试验对比分析，揭示了干湿循环作用对混凝土抗氯离子渗透侵蚀性能影响机制；开展人工海水和天然海水室内加速腐蚀试验，建立氯盐诱发损伤演化模型及海水多离子协同影响机制；开展长周期海工混凝土潮汐区服役试验，监测微宏观性能变化规律，探究室内加速试验与实海试验相关性，此试验制度下室内腐蚀加速因子为4；基于潮汐区干湿循环作用机制，修正修补/防护用硫铝酸盐水泥基材料寿命预测模型。.本项目研究不仅针对水泥基材料，也可以面向其它材料体系，在海洋工程与装备领域具有较好的应用价值。随着本项目后续研究的推进，可开展海洋工程材料体系设计和结构优化，保障材料及结构在海洋腐蚀环境的安全服役。