Collaborative Research: Cathodic Protection Systems for Reinforced Concrete Structures: Performance Improvement through Accelerated Tests and Models

这个项目是响应NSF 98-42耐久性倡议而开发的，其目标是制定和验证一种模型，该模型可以使用加速试验的结果来改进混凝土结构的阴极保护系统的性能。现有的数据和目前对以下过程的理解将被纳入一个全面的三维模型中：(I)混凝土-钢筋界面上铁氧化、氧气还原和水分还原的电化学动力学；(Ii)锌阳极氧化的电化学动力学和随后的锌(Ii)在混凝土-锌界面上的反应；(Iii)水和氧气在混凝土中的迁移；以及(Iv)离子，特别是氯离子在混凝土中的迁移。该模型将在实验室测试中得到验证，然后用于研究控制阴极保护系统以实现最佳性能的策略，避免阳极-混凝土界面处的电阻积累，以及氯化物从钢筋上的电化学迁移。该模型最终将在合适的真实结构中进行现场测试。

9872344WestallThe goal of this project, which was developed in response to the Durability Initiative, NSF 98-42, is to formulate and validate a model which can use results from accelerated tests to improve the performance of cathodic protection systems for concrete structures. Existing data and the current understanding of the following processes will be incorporated within a comprehensive three-dimensional model: (i) the electrochemical kinetics of iron oxidation, oxygen reduction, and water reduction at the concrete-rebar interface; (ii) the electrochemical kinetics of zinc anode oxidation and subsequent reactions of Zn(II) at the concrete-zinc interface; (iii) the transport of water and oxygen through concrete; and (iv) the transport of ions, particularly chloride, through concrete. The model will be validated in laboratory tests and then used to investigate strategies for controlling cathodic protection systems for optimal performance, for avoidance of buildup of electrical resistance at the anode-concrete interface, and for electrochemical migration of chlorides away from the rebar. The model will finally be field-tested in suitable real structures.***