Interface Fracture of Concrete Externally-Reinforced with Composite Materials

9970008本项目的目标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）铁氧化，氧还原和水还原在混凝土-钢筋界面的电化学动力学;（ii）锌阳极氧化的电化学动力学，以及随后的Zn（II）在混凝土-锌界面的反应;（iii）氧气和水通过混凝土的运输;（iii）混凝土中的水的运输。以及（iv）离子，特别是氯离子通过混凝土的传输。该模型将被应用于调查策略（一）控制阴极保护系统，以保护结构，同时最大限度地减少电力消耗，阳极消耗，并产生H2（气体）;（二）规避在阳极混凝土界面电阻的积累;（三）促进机电迁移氯离子远离钢筋;（四）保护钢筋在所有三个维度。

9970008The 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.