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Sensors 2017, 17(11), 2482; https://doi.org/10.3390/s17112482

Determination of Chloride Content in Cementitious Materials: From Fundamental Aspects to Application of Ag/AgCl Chloride Sensors

Faculty of Civil Engineering and Geosciences, Department Materials and Environment, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
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Received: 20 September 2017 / Revised: 19 October 2017 / Accepted: 26 October 2017 / Published: 29 October 2017
(This article belongs to the Section Chemical Sensors)
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Abstract

This paper reports on the advantages and drawbacks of available test methods for the determination of chloride content in cementitious materials in general, and the application of Ag/AgCl chloride sensors in particular. The main factors that affect the reliability of a chloride sensor are presented. The thermodynamic behaviour of silver in the presence or absence of chloride ions is described and kinetic restrictions are addressed. The parameters that can affect the activity of chloride ions in the medium and/or the rate of ion exchange and dissolution/precipitation processes at the sensor’s surface are also considered. In this regard, the contribution of morphology and microstructure of the AgCl layer, binding of chloride ions and the compactness of hydration products around the chloride sensor are highlighted. The important parameters for a reliable sensor’s response are discussed and the possible causes of inaccuracies are evaluated. View Full-Text
Keywords: Ag/AgCl electrode; chloride sensor; concrete; cement; chloride Ag/AgCl electrode; chloride sensor; concrete; cement; chloride
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pargar, F.; Koleva, D.A.; van Breugel, K. Determination of Chloride Content in Cementitious Materials: From Fundamental Aspects to Application of Ag/AgCl Chloride Sensors. Sensors 2017, 17, 2482.

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