Functionality of Zinc Anodes in Repaired Concrete Structures

锌阳极在修复混凝土结构中的功能

• 批准号: 485408-2015
• 负责人: Bassuoni, MohamedTamer
• 金额: $ 1.82万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=584930
• 关键词: Functionality; Zinc; Anodes; Repaired; Concrete

Zinc anodes are an effective, yet economical, method to mitigate the deleterious effect of corrosion of steel rebars embedded in reinforced concrete (RC) structures. Using zinc anodes at any repaired patch in an RC element prevents the onset of steel corrosion within a surrounding area; however, patch accelerated corrosion of steel rebars is a critical phenomenon that may take place in the original concrete in the vicinity of repaired patches depending on a number of parameters. One of the key factors affecting the efficacy of zinc anodes is the resistivity of concrete or cementitious repair material in which these anodes are embedded. However, no robust data are available on the maximum allowable electrical resistivity of repair materials/concretes beyond which zinc anodes cannot prevent corrosion of steel. In response to this issue, Vector Corrosion Technologies Ltd. has been pursuing opportunities to conduct a systematic research study to maximize the efficiency of zinc anodes at protecting RC structures from the risk of corrosion. Hence, the specific objective of this proposal is to explore the effect of concrete resistivity on the efficiency of zinc anodes at mitigating patch accelerated corrosion. Tests will be done on slab prototypes simulating this scenario, while varying the electrical resistivity of the repair concrete in combination with different anode spacing from the bond line with the original concrete. The corrosion activity of rebars will be monitored with time. This study will provide crucial information on the functional range of resistivity of repair materials/concretes and anode spacing, which will optimize the efficiency of an economical technology (zinc anodes) at protecting embedded reinforcement from the risk of corrosion. Over the long-term of this research, practical outcomes can be incorporated in repair guidelines for RC structures. Success of this research will offer a strategic solution for restoring, maintaining and improving vital infrastructural facilities (e.g. transportation infrastructure) required for sustaining the economic growth and quality of life in Canada.

锌阳极是一种有效而经济的方法，以减轻钢铁腐蚀的有害影响 钢筋混凝土（RC）结构中嵌入的钢筋。在钢筋混凝土中的任何修补补丁处使用锌阳极 元件防止周围区域内的钢腐蚀的发生;然而， 钢筋脱空是一种严重的现象，它可能发生在原混凝土修复的附近， 补丁取决于许多参数。影响锌阳极功效的关键因素之一是 嵌入这些阳极的混凝土或水泥修补材料的电阻率。但没有 在超过1000毫米的范围内， 这种锌阳极不能防止钢的腐蚀。针对这一问题，Vector Corrosion Technologies 公司一直在寻求机会进行系统的研究，以最大限度地提高锌的效率 阳极保护钢筋混凝土结构免受腐蚀的风险。因此，这项建议的具体目标是 探讨混凝土电阻率对锌阳极在缓解局部加速腐蚀时的效率的影响 腐蚀将在模拟这种情况的平板原型上进行测试，同时改变电阻率 修补混凝土结合不同的阳极间距从粘结线与原来的 混凝土钢筋的腐蚀活性将随时间进行监测。这项研究将提供至关重要的 有关修补材料/混凝土电阻率功能范围和阳极间距的信息， 优化经济技术（锌阳极）的效率，保护嵌入式钢筋免受 腐蚀的风险。经过长期的研究，实际结果可以纳入修复 钢筋混凝土结构的指导方针。这项研究的成功将为恢复、维护和管理这些系统提供一个战略解决方案。 以及改善重要的基础设施（例如运输基础设施），以维持 加拿大的经济增长和生活质量。