Prestressed structures are commonly used all over the world. They might be subjected to degradation, such as corrosion of the prestressing steel. This can influence the resistance of these structures and induce early failure. Hence, prediction of the corrosion level is important in the assessment of existing prestressed structures. For this purpose, the corrosion process and the accompanying influences on the structure should be modeled. For reinforced concrete (RC) structures, a lot of research and guidelines are available to model the corrosion process. Nevertheless, this corrosion process might differ for prestressed structures, due to the different structural composition, the different geometry of the strands or tendons compared with reinforcement bars, the presence of the prestress, and so on. Moreover, for posttensioned structures, initiation and propagation of corrosion are even more different from corrosion in RC structures, due to the location of the steel in ducts and the lack of direct contact with the surrounding concrete. In this paper, a state-of-the-art on the assessment of prestressed and posttensioned structures subjected to corrosion is given based on a literature review. Different models for the corrosion process and their influence on the structure are discussed. Comparison is made between reinforced, prestressed, and posttensioned structures. Furthermore, some assessment procedures are indicated and relevant topics for further research are given.

中文翻译：

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腐蚀预应力和后张混凝土结构的评估：综述

预应力结构在世界范围内普遍使用。它们可能会退化，例如预应力钢的腐蚀。这会影响这些结构的抵抗力并导致早期失效。因此，腐蚀水平的预测在评估现有预应力结构中很重要。为此，应模拟腐蚀过程和随之而来的对结构的影响。对于钢筋混凝土 (RC) 结构，有大量研究和指南可用于模拟腐蚀过程。然而，预应力结构的腐蚀过程可能会有所不同，因为结构组成不同，与钢筋相比，钢绞线或钢筋束的几何形状不同，存在预应力等。此外，对于后张结构，由于钢在管道中的位置以及与周围混凝土缺乏直接接触，腐蚀的开始和扩展与 RC 结构中的腐蚀更加不同。在本文中，基于文献综述给出了评估受腐蚀的预应力和后张结构的最新技术。讨论了腐蚀过程的不同模型及其对结构的影响。对钢筋、预应力和后张结构进行比较。此外，还指出了一些评估程序，并给出了进一步研究的相关主题。基于文献综述给出了评估受腐蚀的预应力和后张结构的最新技术。讨论了腐蚀过程的不同模型及其对结构的影响。对钢筋、预应力和后张结构进行比较。此外，还指出了一些评估程序，并给出了进一步研究的相关主题。基于文献综述给出了评估受腐蚀的预应力和后张结构的最新技术。讨论了腐蚀过程的不同模型及其对结构的影响。对钢筋、预应力和后张结构进行比较。此外，还指出了一些评估程序，并给出了进一步研究的相关主题。