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Evaluation of Corrosion Progress Using Multichannel Iron Wire Electrodes Embedded in Cement Test Block

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Title: Evaluation of Corrosion Progress Using Multichannel Iron Wire Electrodes Embedded in Cement Test Block
Authors: 安住, 和久1 Browse this author →KAKEN DB
斉藤, 嵩2 Browse this author
石田, 考3 Browse this author
Authors(alt): Azumi, Kazuhisa1
Saito, Shu2
Ishida, Ko3
Keywords: concrete
electric resistance
Issue Date: Dec-2021
Publisher: 一般社団法人 日本鉄鋼協会 (The Iron and Steel Institute of Japan)
Journal Title: 鉄と鋼 : Journal of the iron and steel institute of Japan
Volume: 107
Issue: 12
Start Page: 1074
End Page: 1084
Publisher DOI: 10.2355/tetsutohagane.TETSU-2021-083
Abstract: Eight thin iron wires were embedded in a cement test block to evaluate the corrosion behavior during the carbonization of cement by the CO2 gas absorption. The gas supplied to the chamber containing the cement test block was subsequently changed as air, CO2, and air. Electric resistance measurement of thin wires revealed that the iron kept passivated during supplying of air and uncorroded during the CO2 supply to promote carbonization and began to be corroded from the surface side when the air was resupplied after carbonization due to the existence of oxygen in the air as an oxidizing agent. A series of two-electrode impedance between the selected two iron wires were measured as a function of depth from the surface. The impedance of all electrodes dropped considerably several hours after the CO2 supply. That was caused by the difference in the immersion potential of iron wires as a function of depth, i.e., pH transition from alkaline to neutral range. As a result, iron wires were polarized when electrically connected to each other during the progress of carbonization. When the carbonization was completed, each iron wire showed the impedance response corresponding to the corrosion condition depending on the depth.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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