海洋环境下钢筋混凝土结构内部微环境、钢筋锈蚀原位动态监测与耐久性评估

Based on the in situ monitoring of the long term performance of concrete structure in marine environment, the time-varying rule is studied systematically. First, the development of micro-environment of concrete structure concerning temperature field, moisture field and chloride distribution will be investigated first. At the same time, the development of electromagnetic field will also be investigated. Then the relationship among environmental action, micro-environment of concrete and corrosion of rebar will be revealed. Then in situ dynamic monitoring of key project and concrete members in marine environment exposure site will be proceeded via monitoring system with multi-durability sensor. Based on the results, we will get the deterioration mechanism of concrete structure in marine environment. Also, an assessment system of long term performance of concrete will be set-up. All of the results above provide evidence for protection and repair of structures in marine environment. Also the results can be further used to verify and modify the deterioration model and service life model. This is of great significance for design, construction, maintain and repair of concrete structure in marine environment in the future.

本项目基于海洋环境下混凝土结构长期性能的跟踪监测，揭示该环境下混凝土性能时变规律。首先，通过研究海洋环境下混凝土结构内部温度场、湿度场、离子浓度场等微环境，以及由钢筋锈蚀引起的电磁场等的变化规律，揭示外部环境作用与混凝土内部微环境以及钢筋锈蚀的内在关系。然后，通过混凝土结构耐久性无线监测系统对重大工程和实海暴露混凝土构件进行原位动态监测，建立其长期性能的分析评估模型，揭示海洋环境下钢筋混凝土结构劣化机理，建立混凝土结构耐久性评估体系，为工程的防护与修复决策提供重要依据。最后，依据监测结果验证和修正本项目以及其他研究者提出的损伤劣化模型和寿命预测模型。对今后类似工程的设计、建设、维护与修复具有重大意义。

项目聚焦海洋环境混凝土结构耐久性监测与耐久性评估，通过研究揭示了海洋环境温湿度作用与混凝土内部温湿度响应规律；阐明了水分和离子在混凝土内部的非饱和传输机理，建立了考虑温湿度耦合作用下的氯离子传输模型；制备了高精度混凝土用氯离子传感器和pH传感器，实现了混凝土内部氯离子含量与pH值的原位动态监测；利用法拉第电磁感应等理论推导钢筋及锈蚀产物对电磁场场强及分布规律的影响，建立了磁场信号与钢筋锈蚀程度、锈蚀区域间的定量关系，实现了海洋环境下混凝土内部钢筋锈蚀的精准监测；搭建混凝土结构全寿命性能智慧感知与劣化预警系统，实现了大范围、多目标、多参数、远距离的混凝土结构耐久性参数原位无线监测，为实现混凝土结构耐久性再设计、防护与修复提供适时信息支持和科学决策依据；建立了海洋环境下混凝土结构耐久性评估体系。