Interface Fracture of Concrete Externally-Reinforced with Composite Materials

复合材料外筋混凝土界面断裂

• 批准号: 0002829
• 负责人: Pizhong Qiao
• 金额: $ 6.66万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0002829&HistoricalAwards=false
• 关键词: Interface; Fracture; Concrete; Externally; Reinforced

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.

本项目的目标是提高混凝土结构中钢筋的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，以及随后锌(II)在混凝土-锌界面上的反应；(Iii)氧和水在混凝土中的迁移；以及(Iv)离子，特别是氯离子在混凝土中的迁移。该模型将用于研究如下策略：(I)控制阴极保护系统以保护结构，同时将功率消耗、阳极消耗和H2(气体)的产生降至最低；(Ii)绕过阳极-混凝土界面处的电阻积累；(Iii)促进氯离子从钢筋的机电迁移；(Iv)从所有三个维度保护钢筋。