Measurement Method for Macrocell Corrosion in Concrete Specimen using a Segmented Steel Bar
Measurement Method for Macrocell Corrosion in Concrete Specimen using a Segmented Steel Bar
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使用分段钢筋测量混凝土试件中大细胞腐蚀的方法
DOI：
10.3151/jact.20.222
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发表时间：
2022
影响因子：
2
通讯作者：
N. Otsuki
中科院分区：
文献类型：
--
作者：
S. Miyazato;N. Otsuki
对于腐蚀过程的空间分布，在实验上阐明混凝土中钢筋的腐蚀机理时，必须区分宏细胞和微观细胞，并对其进行定量测量，以确定合适的对策。因此，本研究旨在开发一种测量宏微电池电流的方法，同时将埋入混凝土试件中的钢筋分割成段。宏单元电流定义为在钢筋段之间流动的电流，而微单元电流则在单个段内流动。首先，可以确定分段长度不影响总腐蚀电流的大小，总腐蚀电流是宏电池阳极电流和微电池电流的总和。此外，可以确认宏单元电流的大小随着分段长度的减小而增加。从实验结果来看，当单个片段的长度小于或等于15 mm时，宏电池的阳极电流或微电池的电流的大小都是恒定的。此外，相邻单元之间流动的宏单元电流的测量值也可以评估所有元件之间流动的宏单元电流。此外，使用电测量方法从腐蚀电流得出的钢材损失量等于总腐蚀重量损失量。
Regarding the spatial distribution of the corrosion process it is important to distinguish between macrocells and micro-cells, and to measure them quantitatively when experimentally clarifying the mechanism of corrosion of steel reinforcement embedded in concrete to decide an appropriate countermeasures. Therefore, this study is aimed to develop a method for measuring macrocell and microcell currents while dividing the rebar embedded in a concrete specimen into segments. The macrocell current is defined as the current flowing between rebar segments, whereas the microcell current flows within a single segment. First, it can be confirmed that the segment length does not influence the magnitude of the total corrosion current, which is the total of the macrocell anodic current and the microcell current. In addition, it can be confirmed that the magnitude of the macrocell current increases as the segment length decreases. From the experimental results obtained, the magnitude of the macrocell anodic current or the microcell current became constant when the length of individual segments was 15 mm or less. Also, the measured value of the macrocell current flowing between the neighboring segments could evaluate the macrocell current flowing between all elements. Additionally, the amount of steel loss derived from the corrosion current using electrical measurement methods became equal to the total corrosion weight loss.