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Corrosion rate of steel in concrete: evaluation of confinement techniques for on-site corrosion rate measurements

机译：混凝土中钢的腐蚀速率：现场腐蚀速率测量的限制技术评估

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Earlier on-site investigations and laboratory studies have shown that varying corrosion rates are obtained when different commercially available instruments are used. The different confinement techniques, rather than the different electrochemical techniques used in the instruments, are considered to be the main reason for the discrepancies. This paper presents a method for the quantitative assessment of confinement techniques. The assessment is based on monitoring the operation of the corrosion rate instrument and following the current distribution between the electrode assembly on the concrete surface and a segmented reinforcement bar embedded in the concrete. The applicability of the method was demonstrated for two commercially available corrosion rate instruments based on different confinement techniques. The method provided an explanation of the differences in performance of the two instruments. Correlated measurements of linear polarisation resistance and macro-cell currents allowed the determination of calibration factors. Both instruments overestimated the corrosion rate of passive reinforcement, but underestimated the corrosion rate of reinforcement with intense localised corrosion.
机译：早期的现场调查和实验室研究表明，使用不同的市售仪器时，腐蚀速率会有所不同。认为差异的主要原因是不同的限制技术，而不是仪器中使用的不同的电化学技术。本文提出了一种限制技术的定量评估方法。评估是基于监测腐蚀速率仪器的操作，并遵循混凝土表面上的电极组件与嵌入混凝土中的分段钢筋之间的电流分布。该方法适用于基于不同限制技术的两种市售腐蚀速率仪器。该方法提供了两种仪器性能差异的解释。线性极化电阻和宏单元电流的相关测量值可以确定校准因子。两种仪器都高估了被动钢筋的腐蚀速率，但低估了具有强烈局部腐蚀的钢筋的腐蚀速率。

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