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Sensors (Basel). 2017 Sep 13;17(9). pii: E2099. doi: 10.3390/s17092099.

Chlordetect: Commercial Calcium Aluminate Based Conductimetric Sensor for Chloride Presence Detection.

Author information

1
CAPACITÉS, SAS. 26 Boulevard Vincent Gâche, 44200 Nantes, France. magda.torres@capacites.fr.
2
CMUA, Department of Electrical and Electronics Engineering, Universidad de los Andes, Carrera 1E N, 19A-40 Edificio ML, Piso 7. 111711 Bogotá, Colombia. jf.osma43@uniandes.edu.co.
3
Department of Civil and Environmental Engineering, Universidad de los Andes, Carrera 1E N, 19A-40 Edificio ML, Piso 6. 111711 Bogotá, Colombia. msanchez@uniandes.edu.co.
4
Institute for Research in Civil and Mechanical Engineering (GeM, CNRS UMR 6183), Sea and Littoral Research Institute (IUML, CNRS FR 3473), Université de Nantes, Centrale Nantes, 2 rue de la Houssinière BP 92208, 44322 Nantes, France. Emilio.Bastidas@univ-nantes.fr.
5
Institute for Research in Civil and Mechanical Engineering (GeM, CNRS UMR 6183), Sea and Littoral Research Institute (IUML, CNRS FR 3473), Université de Nantes, Centrale Nantes, 2 rue de la Houssinière BP 92208, 44322 Nantes, France. franck.schoefs@univ-nantes.fr.

Abstract

Chloride presence affects different environments (soil, water, concrete) decreasing their qualities. In order to assess chloride concentration this paper proposes a novel sensor for detecting and measuring it. This sensor is based on electric changes of commercial monocalcium aluminate (CA) when it interacts with chloride aqueous solutions. CA is used as a dielectric material between two coplanar capacitors. The geometry proposed for this sensor allows to assess the chloride content profile, or to make four times the same measurement. Besides, the experimental design gives us the possibility of study not just the chloride effect, but also the time and some geometric effects due to the sensor design. As a result, this sensor shows a limit of detection, sensitivity, and response time: 0.01 wt % Cl- and 0.06 wt % Cl-, and 2 min, respectively, comparable with other non invasive techniques as optical fibre sensors.

KEYWORDS:

chloride concentration; chloride sensors; corrosion; dielectric materials; dielectric spectroscopy; monocalcium aluminate

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