Potentiometric response of Ag/AgCl sensor in Portland and slag cement pastes

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Abstract

Determination of the free chloride content in a concrete structure is important for evaluation of the risk of corrosion of reinforcing steel. The Ag/AgCl sensor is sensitive to chloride ions and exhibits an open circuit potential (OCP) that depends on the chloride ions activity in the environment. The interference of hydroxide and sulfide ions in the pore solution of cementitious materials with the sensor affects the stability of the sensor’s OCP.
In this paper, the sensor’s OCP (i.e. sensor reading) in Portland and slag cement pastes is monitored over 300 days of immersion in solutions with different chloride concentration. The results show the applicability of the chloride sensor for continuous and non-destructive determination of the free chloride content in Portland cement paste. The significantly different OCP of the sensor in slag cement paste was attributed to the interference of sulfide ions and formation of Ag2S on the sensor’s surface. Hence, the content of free chloride ions in slag cement paste could not be determined from the sensor’s OCP. The acid-soluble chloride and water-soluble chloride in the cement pastes were also determined after 300 days of immersion of specimens in the solutions. In case of Portland cement paste, the measured acid and water-soluble chlorides were compared to the sensor reading. The acid and water-soluble chlorides were higher than sensor reading. The release of physically and chemically bound chlorides into the acid and water solvents were the main cause for this trend. The results show the importance of cement type and chloride binding ability of hydration products for the sensor’s response and the acid and water-soluble chloride contents.
Original languageEnglish
Title of host publicationProceeding of the Workshop on Concrete Modelling and Material Behaviour in honor of Professor Klaas van Breugel
Subtitle of host publicationSpecial "Klaas van Breugel" Sessions during the Rilemweek 2018
EditorsGuang Ye
PublisherRilem
Pages214-221
Number of pages8
VolumePRO 126
ISBN (Electronic)978-2-35158-215-2
ISBN (Print)978-2-35158-214-5
Publication statusPublished - 2018
EventWorkshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel - Lijm & Cultuur, Delft, Netherlands
Duration: 27 Aug 201829 Sep 2018

Conference

ConferenceWorkshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel
CountryNetherlands
CityDelft
Period27/08/1829/09/18
OtherSpecial "Klaas van Breugel" Sessions during the Rilemweek 2018 in honour of the retirement of Professor Klaas van Breugel

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