open access

https://hdl.handle.net/2115/87025

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

英語

electric resistance

2022-09-15

一般社団法人 日本鉄鋼協会 (The Iron and Steel Institute of Japan)

ISIJ international

62(9)

1937-1945

Eight thin iron wires were embedded in a cement test block to evaluate corrosion behavior during cement carbonization by CO2 absorption. The gases supplied sequentially to the chamber containing the cement test block were air, CO2, and then air. Electrical resistance measurement of the thin wires revealed that the iron wires remained passivated during the supply of air and uncorroded during the supply of CO2 to promote carbonization. The iron wires started corroding from the surface when the air was resupplied after carbonization due to the presence of O-2 in the air as an oxidizing agent. A set of two-electrode impedances between two selected iron wires was measured as a function of depth from the surface. The impedance of all electrodes dropped considerably several hours after the CO2 supply due to the difference in the immersion potential of the iron wires as a function of depth, that is, the pH transition from alkaline to neutral. Consequently, the iron wires were polarized when electrically connected to each other during carbonization. After carbonization, each iron wire showed an impedance response corresponding to its corrosion condition, which depended on its depth.

学術雑誌論文

Version of Record

0915-1559