Impedance Performance of Concrete under Coupling Effect of Chloride Salts and Stray Currents

doi:10.16552/j.cnki.issn1001-1625.2024.1437

Abstract

Abstract: In order to investigate the variation law of impedance performance of concrete under the coupling effect of chloride salts and stray currents, the performance change of concrete for underground under the double erosion of chloride salts and stray currents was investigated by laboratory simulation method. The results show that the resistivity of concrete gradually decreases with the increase of erosion age. Chloride salts and stray currents coupled erosion significantly reduce the high frequency arc diameter of concrete. And the resistance of the unconnected conducting path of concrete under erosion tended to increase and then decrease, while the capacitance tended to decrease and then increase. The coupling effect of chloride salts and stray currents reduces the obstruction to harmful ion transport in concrete, accelerates steel corrosion, and thereby decreases concrete durability. This study can provide a scientific basis for the durability assessment and protection of metro concrete structures.

Key words: chloride salt erosion, stray current, concrete impedance, durability, electrochemical test

CLC Number:

TU525

PENG Yuyi, ZHU Tiemei, HAN Guoqi, LYU Mengfan, ZHANG Xinyu, WANG Yan. Impedance Performance of Concrete under Coupling Effect of Chloride Salts and Stray Currents[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2495-2502.

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