Thesis defence F. Pargar: chloride sensors

16 November 2018 10:00 - Location: Aula, TU Delft - By: webredactie

The application of Ag/AgCl electrodes as chloride sensors in cementitious materials. Promotor: K. van Breugel (CiTG).

Determination of the chloride content in a reinforced concrete structure is important for evaluation of the risk of chloride-induced corrosion of reinforcement. The traditional techniques for chloride determination in concrete are laborious, time-consuming and cannot be used for continuous monitoring of the chloride content. The investigation on the use of Ag/AgCl electrodes as chloride sensors in cement-based materials dates back to 1990s. Interpretation of the sensor’s response in cementitious materials requires the knowledge of chloride sensor’s characteristics and the interaction between the sensor and the surrounding medium. Hence, the stability of the chloride sensor’s response in cementitious materials depends on the properties of Ag/AgCl interface, AgCl/cement paste interface and the pore solution composition of cementitious materials. The influence of these factors on the stability of the sensor’s response was studied in this thesis. 

To summarize, this thesis investigated the performance of the chloride sensor in alkaline medium of cementitious materials. Based on the study of influencing parameters on the sensor’s response, suggestions regarding sensor production and surrounding medium around the sensor have been given for a better performance of the sensor. These give guidance for interpretation of the sensor’s response and application of the chloride sensor in cementitious materials. 

More information?

For access to theses by the PhD students you can have a look in TU Delft Repository, the digital storage of publications of TU Delft. Theses will be available within a few weeks after the actual thesis defence.