Abstract
A corrosion sensor for monitoring the corrosion state of cover mortar was developed. The sensor was tested in cement mortar, with and without the addition of chloride to simulate the adverse effects of chloride-contaminated environmental conditions on concrete structures. In brief, a linear polarization resistance method combined with an embeddable reference electrode was utilized to measure the polarization resistance (Rp) using built-in sensor electrodes. Subsequently, electrochemical impedance spectroscopy in the frequency range of 1 kHz to 50 kHz was used to obtain the cement mortar resistance (Rs). The results show that the polarization resistance is related to the chloride content and Rs; ln (Rp) is linearly related to the Rs values in mortar without added chloride. The relationships observed between the Rp of the steel anodes and the resistance of the surrounding cement mortar measured by the corrosion sensor confirms that Rs can indicate the corrosion state of concrete structures.
Highlights
In recent years, chloride-induced corrosion of structural steel has caused serious damage to concrete structures all over the world
A sensor system consisting of a reference electrode, an electrical resistance measurement unit and a polarization resistance unit was developed and tested in cement mortar, with and without chloride added, to simulate the corrosion behavior of chloride-contaminated concrete structures
The mortar resistance depends significantly on the chloride content of the mortar, but this effect does not seem to be significant when the chloride content is greater than 3%
Summary
Chloride-induced corrosion of structural steel has caused serious damage to concrete structures all over the world. In addition to ameliorating the above economic concerns, in situ corrosion sensors might provide information about service conditions and inform further design requirements This new branch of sensor technology is largely based on the development of novel electrochemical monitoring techniques, including half-cell potential, linear polarization resistance (LPR), AC impedance spectroscopy, electrical resistance measurements and several other techniques [4,5,6]. Each of these sensors or techniques has advantages and disadvantages that determine the environment in which it is used [7,8,9,10]. This paper summarizes the relationship between the cover-zone mortar resistance (Rs) and the Rp of the steel anodes, and aims to predict Rp from the Rs values of the surrounding cover mortar using the parameters obtained from the developed sensors, instead of directly measuring the Rp of the structural steel
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