Interface Fracture of Concrete Externally-Reinforced with Composite Materials

0002829本项目的目的是提高混凝土结构中钢筋阴极保护系统的性能。现有的数据和我们目前对以下过程的理解将被纳入一个全面的三维模型；(i)钢筋界面铁氧化、氧还原和水还原的电化学动力学；（ii）锌阳极氧化的电化学动力学，以及Zn （ii）在混凝土-锌界面的后续反应；（iii）通过混凝土输送氧气和水；（iv）离子，特别是氯离子通过混凝土的传输。该模型将用于研究以下策略：(i)控制阴极保护系统以保护结构，同时最大限度地减少功率消耗、阳极消耗和H2（气体）的产生；（ii）避免在阳极-混凝土界面处产生电阻；（iii）促进氯化物从钢筋上的机电迁移；（四）对钢筋的三维保护。

0002829The goal of this project is to improve the performance of cathodic protection systems for reinforcing steel in concrete structures. Existing data and our 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 oxygen and water through concrete; and (iv) the transport of ions, particularly chloride, through concrete. The model will be applied to investigate strategies for (i) controlling cathodic protection systems to protect the structure, while minimizing consumption of power, consumption of the anode, and generation of H2(gas); (ii) circumventing buildup of electrical resistance at the anode-concrete interface; (iii) facilitating electromechanical migration of chloride away from the rebar; (iv) protection of rebar in all three dimensions.