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 (26.05.2014-28.05.2014)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2014 |
| Autor(en): | Pargar, F. ; Koenders, E. A. B. ; Koleva, D. A. |
| Art des Eintrags: | Bibliographie |
| Titel: | The importance of chloride sensors stability in monitoring ageing phenomena in concrete structures: Ag/AgCl electrodes performance in simulated pore-water environment |
| Sprache: | Englisch |
| Publikationsjahr: | Mai 2014 |
| Verlag: | DCMat Ageing Centre, Delft University of Technology |
| Veranstaltungstitel: | 1st Ageing of Materials & Structures Conference |
| Veranstaltungsort: | Delft, The Netherlands |
| Veranstaltungsdatum: | 26.05.2014-28.05.2014 |
| URL / URN: | http://resolver.tudelft.nl/uuid:23c5c7aa-fbea-44c7-a0ec-fc91... |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | chloride sensor, electrochemical impedance spectroscopy, open circuit potential |
| Fachbereich(e)/-gebiet(e): | 13 Fachbereich Bau- und Umweltingenieurwissenschaften 13 Fachbereich Bau- und Umweltingenieurwissenschaften > Institut für Werkstoffe im Bauwesen |
| Hinterlegungsdatum: | 04 Jun 2015 08:44 |
| Letzte Änderung: | 01 Jun 2016 07:27 |
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