Characterization of embeddable potentiometric thick-film sensors for monitoring chloride penetration in concrete

Gandía-Romero, José Manuel; Bataller, Román; Monzón, Pablo; Campos, Inmaculada; García‐Breijo, Eduardo; Valcuende, M.; Soto, Juán

doi:10.1016/j.snb.2015.07.056

Cited by 42 publications

(33 citation statements)

References 31 publications

(21 reference statements)

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“…e interference of hydroxide ions would determine an OCP response, not proportional to the activity of chloride ions only. Hence, the sensor's OCP is associated with the ratio of chloride to hydroxide ions at the sensor's surface [6,[9][10][11][12][13][14]. In such cases, the measured OCP does not only present the Ag/AgCl equilibrium (3) but also reflects a mixed potential described by the Ag/AgCl/Ag 2 O equilibrium (4).…”

Section: Introductionmentioning

confidence: 99%

Potentiometric Response of Ag/AgCl Chloride Sensors in Model Alkaline Medium

Pargar

Kolev

Koleva

et al. 2018

Advances in Materials Science and Engineering

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The stability and reproducibility of an Ag/AgCl sensors’ response in an alkaline medium are important for the application of these sensors in cementitious materials. The sensors’ response, or their open circuit potential (OCP), reflects a dynamic equilibrium at the sensor/environment interface. The OCP response in an alkaline medium is affected by the presence of hydroxide ions. The interference of hydroxide ions leads to inaccuracies or a delay in the sensors’ response to a certain chloride content. In this article, the potentiometric response (or OCP evolution) of the chloride sensors is measured in model solutions, resembling the concrete pore water. The scatter of the sensors’ OCP is discussed with respect to the interference of hydroxide ions at varying chloride concentration in the medium. The deviation of the sensor’s response from its ideal performance (determined by the Nernst law) is attributed to dechlorination of the AgCl layer and the formation of Ag2O on the sensor’s surface. Results from the surface XPS analysis of the AgCl layer before and after treatment in alkaline medium confirm these observations in view of chemical transformation of AgCl to Ag2O.

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Section: Introductionmentioning

confidence: 99%

Potentiometric Response of Ag/AgCl Chloride Sensors in Model Alkaline Medium

Pargar

Kolev

Koleva

et al. 2018

Advances in Materials Science and Engineering

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“…Several publications using electrochemical embedded sensors to monitor corrosion of RCS [46,73,[78][79][80][81][82][83][84][85][86][87][88][89][90] including sensors with wireless communication of data [51,[91][92][93][94][95] have been found. In 2009, Martínez and Andrade [88], published a paper where several examples of recorded data for corrosion potential, electrical resistance and corrosion rates were presented.…”

Section: Corrosion Assessment With Electrochemical Sensorsmentioning

confidence: 99%

“…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].…”

Section: Corrosion Assessment With Electrochemical Sensorsmentioning

confidence: 99%

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

Figueira¹

2017

Applied Sciences

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Several methods for corrosion monitoring of reinforced concrete structures (RCS) have been proposed in the last few decades. These systems may be used either in new, existing or repaired structures. The corrosion monitoring can be performed by different methodologies. These may or may not be destructive, use different degrees of complexity and cost, and provide information on the progression and kinetics of the corrosion phenomena. The destructive methods are limited to sampling. Therefore, these may not be representative of the whole structure, which is extremely important in RCS with large heterogeneities both in terms of materials used and in terms of the exposure environment. Within this context, non-destructive methods have been widely developed, which are intended to provide quick information about the entire structure. Ideally, these systems should be able to detect the corrosion state of the steel inside the concrete, the main causes of corrosion and the evolution of corrosion phenomena over time. This manuscript reviews and summarizes the actual state of the art and the main achievements in the field of electrochemical sensors based on non-destructive methods for corrosion monitoring of RCS in the last few years. The challenges and perspectives in this field will also be discussed.

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“…The equations that relate the effect of an interferent on the electrode potential have been developed in a previous work [34]. Equation 6 deals with the case of the interference of chloride ions.…”

Section: 15chloride Interferencementioning

confidence: 99%

Potentiometric thick-film sensors for measuring the pH of concrete

Gandía-Romero

Campos

Valcuende

et al. 2016

Cement and Concrete Composites

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Concrete carbonation is one of the main triggers of the corrosion process and hence of the premature deterioration of concrete reinforcements. In order to monitor and control the carbonation process, a potentiometric sensor using thick-film technology was developed. This paper includes the results of the research carried out to characterise the pH sensor, including the materials, response time, sensitivity, detection limit, reproducibility, reversibility and the study of chloride interference. The sensors have been studied in pore solutions and concrete specimens. The study shows that the thick-film sensor has a potentiometric response to variations in pH and is capable of providing continuous, real-time information on the progress of the carbonation front.

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Characterization of embeddable potentiometric thick-film sensors for monitoring chloride penetration in concrete

Cited by 42 publications

References 31 publications

Potentiometric Response of Ag/AgCl Chloride Sensors in Model Alkaline Medium

Potentiometric Response of Ag/AgCl Chloride Sensors in Model Alkaline Medium

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

Potentiometric thick-film sensors for measuring the pH of concrete

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