Durability in Design of Light Rail Reinforced Concrete Structures

IF 1.1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Pub Date : 2023-06-09 DOI:10.5006/4167

William Nash

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引用次数: 0

Abstract

Recently, a number of light rail systems have been built or extended in North America. Typical design lives of metallic and concrete transit structures are required to exceed 75 y, with exposure to de-icing salts, freeze/thaw, and the potential for stray currents. Measures to mitigate the risks of reinforcement corrosion to rail structures have progressed over the last century, with some diversion between the preferred practices in Europe and North America. One significant difference with large cost impacts on projects is the means and methods to achieve continuity of the reinforcing steel within rail structures to control stray currents to negligible levels. Herein we review the available standards and literature as it relates to the risks of stray current corrosion of reinforcing steel, specifically with respect to the requirement for welding reinforcing. Field measurements of steel resistivity taken during the construction of rail structures are presented to clarify the as-built condition. Taking into account the effect of stray currents on the chloride threshold for corrosion initiation, methods are recommended to achieve durability requirements for the least lifecycle cost to asset owners.

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轻轨钢筋混凝土结构耐久性设计

最近，北美新建或扩建了许多轻轨系统。金属和混凝土运输结构的典型设计寿命要求超过75年，暴露于除冰盐，冻结/解冻和杂散电流的可能性。减轻钢轨结构钢筋腐蚀风险的措施在上个世纪取得了进展，在欧洲和北美的首选做法之间有一些转移。与对工程产生巨大成本影响的一个显著区别是实现钢轨结构内钢筋连续性以将杂散电流控制到可忽略不计的水平的手段和方法。在这里，我们回顾了现有的标准和文献，因为它涉及到钢筋的杂散电流腐蚀的风险，特别是关于焊接加固的要求。本文介绍了钢轨结构施工过程中钢轨电阻率的现场测量结果，以阐明钢轨结构的竣工情况。考虑到杂散电流对氯离子起始腐蚀阈值的影响，建议采用一些方法来达到耐久性要求，同时使资产所有者的生命周期成本最低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

2.80

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： CORROSION is the premier research journal featuring peer-reviewed technical articles from the world’s top researchers and provides a permanent record of progress in the science and technology of corrosion prevention and control. The scope of the journal includes the latest developments in areas of corrosion metallurgy, mechanisms, predictors, cracking (sulfide stress, stress corrosion, hydrogen-induced), passivation, and CO2 corrosion. 70+ years and over 7,100 peer-reviewed articles with advances in corrosion science and engineering have been published in CORROSION. The journal publishes seven article types – original articles, invited critical reviews, technical notes, corrosion communications fast-tracked for rapid publication, special research topic issues, research letters of yearly annual conference student poster sessions, and scientific investigations of field corrosion processes. CORROSION, the Journal of Science and Engineering, serves as an important communication platform for academics, researchers, technical libraries, and universities. Articles considered for CORROSION should have significant permanent value and should accomplish at least one of the following objectives: • Contribute awareness of corrosion phenomena, • Advance understanding of fundamental process, and/or • Further the knowledge of techniques and practices used to reduce corrosion.