Pargar, F. ; Koenders, E. A. B. ; Koleva, D. A. (2014)
The importance of chloride sensors stability in monitoring ageing phenomena in concrete structures: Ag/AgCl electrodes performance in simulated pore-water environment.
1st Ageing of Materials & Structures Conference. Delft, The Netherlands (26-28 May 2014)
Conference or Workshop Item, Bibliographie
Abstract
One of the reported problems associated with the performance of Ag/AgCl electrodes in alkaline environment, as concrete pore water, has been their poor stability. Open circuit potentials are typically observed to be stable for a time period of a few minutes to some days depending on the thickness and microstructure of the sparingly soluble AgCl and the subsequently developed mixed potentials at the electrode/solution interface. In this paper the open circuit potential of the chloride sensors were monitored over time in simulated pore solution with and without chloride and their electrochemical response recorded via electrochemical impedance spectroscopy (EIS). The alterations in response of the sensors can be denoted to transformation of the AgCl layer to Ag2O in chloride-free high pH environment as in concrete pore water. Recovery of the AgCl layer takes place in chloridecontaining medium, where establishing of sensor stability is determined by the chloride concentration.
| Item Type: | Conference or Workshop Item |
|---|---|
| Erschienen: | 2014 |
| Creators: | Pargar, F. ; Koenders, E. A. B. ; Koleva, D. A. |
| Type of entry: | Bibliographie |
| Title: | The importance of chloride sensors stability in monitoring ageing phenomena in concrete structures: Ag/AgCl electrodes performance in simulated pore-water environment |
| Language: | English |
| Date: | May 2014 |
| Publisher: | DCMat Ageing Centre, Delft University of Technology |
| Event Title: | 1st Ageing of Materials & Structures Conference |
| Event Location: | Delft, The Netherlands |
| Event Dates: | 26-28 May 2014 |
| URL / URN: | http://resolver.tudelft.nl/uuid:23c5c7aa-fbea-44c7-a0ec-fc91... |
| Abstract: | One of the reported problems associated with the performance of Ag/AgCl electrodes in alkaline environment, as concrete pore water, has been their poor stability. Open circuit potentials are typically observed to be stable for a time period of a few minutes to some days depending on the thickness and microstructure of the sparingly soluble AgCl and the subsequently developed mixed potentials at the electrode/solution interface. In this paper the open circuit potential of the chloride sensors were monitored over time in simulated pore solution with and without chloride and their electrochemical response recorded via electrochemical impedance spectroscopy (EIS). The alterations in response of the sensors can be denoted to transformation of the AgCl layer to Ag2O in chloride-free high pH environment as in concrete pore water. Recovery of the AgCl layer takes place in chloridecontaining medium, where establishing of sensor stability is determined by the chloride concentration. |
| Uncontrolled Keywords: | chloride sensor, electrochemical impedance spectroscopy, open circuit potential |
| Divisions: | 13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials |
| Date Deposited: | 04 Jun 2015 08:44 |
| Last Modified: | 01 Jun 2016 07:27 |
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