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Monitoring the Electrochemical Response of Chloride Sensors Embedded in Cement Paste

Published online by Cambridge University Press:  27 March 2015

F. Pargar ,
D.A. Koleva ,
E.A.B. Koenders  and
K. van Breugel
F. Pargar
Affiliation:
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Section of Materials and Environment, Stevinweg 1, 2628 CN Delft, The Netherlands.
D.A. Koleva
Affiliation:
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Section of Materials and Environment, Stevinweg 1, 2628 CN Delft, The Netherlands.
E.A.B. Koenders
Affiliation:
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Section of Materials and Environment, Stevinweg 1, 2628 CN Delft, The Netherlands.
K. van Breugel
Affiliation:
Faculty of Civil Engineering and Geosciences, Delft University of Technology, Section of Materials and Environment, Stevinweg 1, 2628 CN Delft, The Netherlands.
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Abstract

This work presents the electrochemical behavior of Ag/AgCl electrodes (chloride sensors) in cement paste environment, monitored over a period of 180 days via open circuit potential (OCP) readings and electrochemical impedance spectroscopy (EIS). The EIS response indicates modification of the sensors’ morphology, in particular alteration of the AgCl layers, as a result of continuous chloride penetration into the bulk matrix towards the vicinity of the sensor/cement paste interface. A gradual shift to more cathodic OCP values and stabilization at approximately -1mVSCE to 2mVSCE was observed at the end of the test, reflecting chloride content of 820mM to 930mM in the pore solution surrounding the sensors, which differs 5-10% from the chloride concentration in the external solution. The water soluble chloride content in the cement pate, as destructively measured wet chemically by Volhard method and photometry, was in the range of 1100mM - 1300mM i.e. about 30-50% more than the chloride concentration in the external solution. This difference of maximum 50% in the recorded chloride levels is attributed to the fact that the sensors “read” the average amount of free chloride at the interface sensor/cement paste, while the destructively measured water soluble chloride reflects the average free (with possible contribution of physically bound chloride) in the total volume of analyzed cement paste. It can be concluded that for the conditions of this experiment, more reliable free chloride content is measured via the sensors’ readings. Hence, if chloride thresholds for corrosion initiation are to be determined, the sensors’ readings will be more representative and accurate if compared to destructive water soluble chloride determination.

Keywords

compositeelectrical propertiesadditives
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1768: Symposium 6D – Concrete with Smart Additives and Supplementary Cementitious Materials to Improve Durability and Sustainability of Concrete Structures. , 2015 , imrc2014-6d-018
Copyright
Copyright © Materials Research Society 2015 

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References

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