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

9872344 westall该项目的目标是根据耐久性倡议（NSF 98-42）制定和验证一个模型，该模型可以使用加速试验的结果来提高混凝土结构阴极保护系统的性能。现有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、氧还原和水还原的电化学动力学；（ii）锌阳极氧化及锌在混凝土-锌界面的后续反应的电化学动力学；（iii）通过混凝土输送水和氧气；（iv）离子，特别是氯离子通过混凝土的传输。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的策略，以获得最佳性能，避免在阳极-混凝土界面积聚电阻，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实际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.***