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The selection and use of cathodic protection systems for the repair of reinforced concrete structures

机译：阴极保护系统在钢筋混凝土结构维修中的选择和使用

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Cathodic protection (CP) is an electrochemical repair technique that has increasingly been used for the repair of reinforced concrete structures in the UK and worldwide. Cathodic protection generally works by the passing of a small electrical current from the anode to the corroding steel reinforcement thereby protecting it from further deterioration by increasing the hydroxyl ions locally. This paper has looked at the advantages and disadvantages of using the two types of cathodic protection systems, namely sacrificial anode and impressed current CP, and highlighted some of the design considerations and challenges faced on a number of case histories that Mouchel have undertaken. From our experience the decision whether to use an impressed current CP system or a sacrificial anode CP system is influenced by a number of factors including but not limited to the condition (the level and extent of deterioration) of the structure, the client's budget and the anticipated life expectancy of the structure following the repairs. Experience at Mouchel indicates that the circumstances where SACP is most suitable includes small and targeted repairs, repairs where budget costs are limited and repairs where the life expectancy is anticipated to be around 10 years. On the other hand, ICCP is generally used to address significant corrosion problems to large structures and surface areas, where life expectancy is expected to be more than 25 years and where access and traffic management are challenging and very costly.
机译：阴极保护（CP）是一种电化学修复技术，在英国和全球范围内已越来越多地用于修复钢筋混凝土结构。阴极保护通常通过使一小电流从阳极流经腐蚀的钢增强材料而发挥作用，从而通过局部增加氢氧根离子使其免受进一步的破坏。本文探讨了使用两种类型的阴极保护系统（即牺牲阳极和外加电流CP）的优缺点，并着重指出了Mouchel在许多案例中面临的一些设计考虑和挑战。根据我们的经验，是否使用外加电流阴极保护系统或牺牲阳极阴极保护系统的决定受许多因素影响，包括但不限于结构的条件（恶化的程度和程度），客户的预算以及维修后预期结构的预期寿命。 Mouchel的经验表明，最适合SACP的情况包括小规模有针对性的维修，预算成本有限的维修以及预期寿命约为10年的维修。另一方面，ICCP通常用于解决大型结构和表面区域的重大腐蚀问题，这些区域的预期寿命将超过25年，并且访问和交通管理面临挑战且成本很高。

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