Sensor for oxygen evaluation in concrete

Corrosion risk assessment of chloride-contaminated concrete structures using embeddable multi-cell sensor system

“…Thus, it can be concluded that the concrete service conditions, including concrete resistance and chloride content surrounding the steel surface, play a decisive role in the corrosion behavior of the steel electrode. This result can be explained logically by the optimal combination of the sufficient ingressive ionic conductivity and the availability of oxygen in the chloride-contaminated concrete structures [29].…”

Electrocatalytic Reduction of Oxygen on Graphitized Carbon Electrode Modified with 5,15-Bis(pyrid-4-yl)-3,7,13,17-tetramethyl- 2,8,12,18-tetraethylporphine and Its Cu(II) and Fe(III) Complexes

“…Next, the working electrode was dipped in the electrolyte and cyclic I,E-curves were recorded in the potential range of 0.5 ÷ -1.5 V. After completing the measurement under argon, the gaseous oxygen was bubbled through the solutions for 60 minutes. Potentials of cathodic (E c ) and anodic (E a ) peaks for observed processes with the participation of studied compounds were fixed with the accuracy of ±0.01 V. The values of redox potentials were determined as the average in a series of [5][6] parallel experiments ( ).…”

“…The reduction reaction of molecular oxygen is one of the most important reactions in life processes (biological respiration) and in many electrochemical technologies such as chlor-alkaline electrolysis with air-depolarized cathodes, [1][2][3] metal-air batteries, [4] electrochemical sensors, [5,6] and etc. Depending on the electrode material, its surface modification and the nature of the used catalysts, this reaction may take place both via 4-electron mechanism with the rupture of the O-O bond to give water (in acid medium) or hydroxide ion (in basic medium), and via 2-electron to generate hydrogen peroxide (in acid solutions) or hydrogen peroxide ion (in alkaline solutions).…”

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

“…In the early 1990s, a sensor based on the measurement of the galvanic current in macro cells was proposed by Schiessl and Raupach [67]. In the last two decades' sensors were developed for measuring the resistivity of the concrete [2,68,69], i corr [57,70], reduction limit current of oxygen [71,72] and chloride content [47,[73][74][75][76][77]. There are several commercial systems that allow the simultaneous measurements of all or some of the abovementioned parameters [78].…”

“…It s necessary to take into consideration the processing and presentation of the data together with the durability of the sensor itself. Nowadays, embedded sensors are used to measure the following parameters: chloride content [75,78,86,95], pH [106,107], moisture [108,109], i corr [46,73,80,81,88], temperature [93,108,110], potential [89,91], ρ [43,[111][112][113], oxygen transport [72,78] and i gal [82,90].…”