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Electrochemical impedance spectroscopy of sand of varied particle size and water content using the three-electrode system

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Published/Copyright: November 15, 2018
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Abstract

The EIS behavior, corrosiveness, and seepage structure of sand of varied water content were studied by means of electrochemical impedance spectroscopy under the three-electrode system. The results show that the effect of void geometry on the impedance modulus disappears at the high frequency range. However, the impedance modulus is greatly affected by the pore geometry and the effect is greater for standard sand with increased randomness when the frequency is under 5 Hz. The pore structure of standard sand increases Re by an order of magnitude and the increase is more obvious when water content is low. By contrast, Rt decreases with increasing water content. The corrosiveness of the sand system increases with increasing water content. The electrochemical process of a wet sand system shifts from a kinetic control process to a material transfer control process as frequency changes from a high to a low range. The hydraulic radius, a parameter of the seepage structure, fluctuates between 0.01 and 0.03 mS. The magnitude of W, showing a change in tortuosity T, fluctuates between 10−5 and 10−6.

Kurzfassung

Für den vorliegenden Beitrag wurde das elektrochemische Impedanzverhalten, die Aggressivität bezüglich Korrosion und die Versicherungsstruktur von Sanden mit verschiedenen Wassergehalten untersucht, indem das Verfahren der elektrochemischen Impedanzspektroskopie mit dem Drei-Elektroden-System zum Einsatz. Die Ergebnisse zeigen, dass die Auswirkung der Porengeometrie auf den Impedanzmodul im hochfrequenten Bereich verschwindet. Dem gegenüber wird der Impedanzmodul sehr durch die Porengeometrie beeinflusst, und dieser Effekt ist größer für Standardsande mit einer größeren Zufälligkeit wenn die Frequenz unter 5 Hz beträgt. Die Porenstrukture der Standardsande Re nimmt um eine Größenordnung zu und diese Zunahme ist umso offensichtlicher, wenn der Wassergehalt niedrig ist. Dem gegenüber nimmt Rt mit zunehmendem Wassergehalt ab. Die Aggressivität bezüglich Korrosion des Sandsystems nimmt mit zunehmendem Wassergehalt zu. Der elektrochemische Prozess des nassen Sandsystems verschiebt sich von einem kinetisch kontrollierten Prozess zu einem materialkontrollierten Prozess, wenn sich die Frequenz von einem hohen zu einem niedrigen Bereich verändert. Der hydraulische Radius, ein Parameter für die Versickerungsstruktur, fluktuiert zwischen 0,01 und 0,03 mS. Die Größe von W, das die Veränderung der Tortuosität T anzeigt, fluktuiert zwischen 10−5 und 10−6.


*Correspondence Address, Prof. Dr. Pengju Han, School of Civil Engineering, Taiyuan University of Technology, No.79, Yingze West Street, Taiyuan 030024, Shanxi Province, China

Ruizhen Xie, born in 1991, is a PhD student at Taiyuan University of Technology, China. She obtained her bachelor's degree in Material Processing and Control Engineering from Shanxi Datong University in Datong, China, in 2014. Her primary research area is geotechnical engineering.

Zhengguang Chen, born in 1996, is a junior student at Taiyuan University of Technology, China. He is majoring in Civil Engineering.

Chen Feng, born in 1997, is a junior student at Taiyuan University of Technology, China. She is majoring in civil engineering.

Dr. Bin He, born in 1985, is a lecturer at Taiyuan University of Technology, China. He obtained his doctoral degree in Geotechnical Engineering from the same university in 2016. He has been a visiting scholar of the Monash University, in Melbourne Australia. His study focuses on the corrosive and mechanical properties of civil and steel materials.

Dr. Fuli Ma, born in 1987, is a lecturer at Taiyuan University of Technology, China. She obtained her PhD degree in Civil Engineering at the same University. Her primary research area is mechanics and microstructure of loess.

Prof. Dr. Pengju Han, born in 1981, is Professor at Taiyuan University of Technology, China. He obtained his doctorate degree in Geotechnical Engineering from the same university in 2009. He has been a visiting scholar at Pennsylvania State University in Middletown, USA. His study focuses on the corrosive and mechanical properties of civil materials.

Prof. Dr. Y. Frank Chen, born in 1956, is currently Tenured Professor at Pennsylvania State University, Middletown, USA, and Distinguished Professor at Southwest University, Chongqing University, and East China Jiaotong University, all in China. He obtained his PhD degree from the University of Minnesota, Minneapolis, USA in 1988. He specializes in dynamic soil-structure interaction, computational methods, bridge engineering, foundations, dynamic-load resistant designs, geo-environmental engineering, and construction materials.


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Published Online: 2018-11-15
Published in Print: 2018-09-30

© 2018, Carl Hanser Verlag, München

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