A simple and efficient non-destructive magnetic sensor for reinforced concretesteel rebar corrosion monitoring
Publish Year: 1401
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
ELECTROCHEMISTRY017_093
تاریخ نمایه سازی: 9 اردیبهشت 1402
Abstract:
Corrosion of steel reinforcements buried in concrete is one of the important factors that threatenthe durability of reinforced concrete structures. Corrosion is an electrochemical process that reaches the surface of rebars due to the invasion of chlorine and carbon dioxide ions present around concrete structures. The corrosion rate of steel reinforcement depends on the strength of theconcrete and the time of exposure to the corrosive environment. If the exposure time in thecorrosive environment increases, the rate of corrosion also increases. On the other hand, if the resistance of concrete is high, it will reduce the corrosion rate of steel. The corrosion of steel rebars can damage concrete structures. Corrosion of steel rebar damages concrete structures with theproduction of corrosion products which causes an increase in the volume of rebars inside the concrete. Therefore, proper monitoring of structures in terms of corrosion performance and taking appropriate measures at the right time can bring a lot of savings .Corrosion monitoring can provide more complete information about the change in a structure's condition at the right time .Corrosion monitoring methods are categorized based on various criteria, such as destructive or nondestructive, direct or indirect, penetrating or non-penetrating, and electrochemical or nonelectrochemical.The aim of this paper is to present the chloride-initiated corrosion process and its monitoring technique. In this respect, we have evaluated and monitored corrosion using a nondestructive technique based on the electromagnetic method. To make reinforced concrete, a plastic cast and four pieces of steel were used. The mixing ratio of cement and sand is ۱:۵. To increase thepermeability and adhesion of concrete, reinforced concrete is immersed in water for several days. In the second stage, the rebars in the concrete have suffered intentional accelerated corrosion. It is possible to induce the corrosion of the reinforced concrete steel sample by applying direct currentto the steel rebars in contact with an electrolyte of ۳.۵% salt water.In the third stage, a non-destructive technique based on the electromagnetic method is used tomonitor the corrosion of reinforced concrete. It is an innovative technique involving the combination of a handmade search coil (about ۱۱ mm in diameter, ۲۵ turns of ۰.۳ mm copper wire)and an LCR meter device at fixed frequency of ۱۰۰ kHz. By moving the search coil on the surface of concrete in regular pattern for corrosion monitoring, LCR meter device indicates inductance (Lin μH) and quality factor of the inductor (Q, as a dimensionless number). Through corrosion monitoring by using a LCR meter device, it can be concluded that the values of the parameter L ofcorroded rebar is between the values of a non-corroded rebar and that of concrete. In other words,a section of reinforced concrete with the highest L indicates non-corroded rebar, and a section withthe lowest L indicates concrete. The inductance parameter (L) gives a better indication for corrosion monitoring compared to quality parameter (Q). In monitoring the corrosion of reinforced concrete, the accuracy is higher. Finally, it can be concluded that this simple experimental setup employing a search coil can easily be used for monitoring corrosion through recording spatialchanges of L and/or Q parameters by an LCR meter.
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Authors
Behnaz Hazrati Dorigh
Faculty of Science, Shahid Madani University, Tabriz, Iran
Erfan Khakzadeh
Faculty of Chemistry, University of Tabriz, Tabriz, Iran
Iraj Ahadzadeh
Faculty of Chemistry, University of Tabriz, Tabriz, Iran
Rahman Salamat-Ahangari
Faculty of Science, Shahid Madani University, Tabriz, Iran