Abstract
An Ag/AgCl electrode used as a corrosion sensor in a reinforced concrete structure is considered as having good application prospect. However, its performance under complex conditions, such as dry-wet cycle condition, is not affirmed. In the current study, the performance of Ag/AgCl as chloride selective electrode in mortar exposed to dry-wet cycle condition was investigated. A simple Ag/AgCl electrode was prepared and fabricated by electrochemical anodization. These Ag/AgCl electrodes were embedded into a mortar specimen with temperature sensors, humidity sensors and anode ladder monitoring system (ALS). After 28 d curing time, the upper surface of mortar specimen was wetted (with 5% NaCl solution) and dried regularly. The obtained results indicate that Ag/AgCl electrode responds to the ingress of chloride ion, sensitively. The chloride ion concentration variation can be reflected by the potential trend. Furthermore, the balance potential of Ag/AgCl electrodes is influenced by dry-wet cycles. Compared with ALS, it demonstrates that Ag/AgCl electrodes are more sensitive to chloride. The research provides the key element for the specific application of Ag/AgCl electrode for corrosion monitoring in the future.
Highlights
Reinforced concrete (RC) has been widely used in coastal environments, such as bridges, docks and offshore platforms, while its unexpected durability always baffles the construction industry [1,2,3].Chloride-induced steel corrosion has commonly been accepted as the major reason for deterioration of RC structures [4,5,6]
Ueli Angst et al [29] found that Ag/AgCl electrodes can be successfully used in highly alkaline environments, and it is only in the complete absence of chloride that the potential is affected by the pH
By the results presented in this investigation, the efficiency of Ag/AgCl electrode application in practical cement-based material is evaluated
Summary
Reinforced concrete (RC) has been widely used in coastal environments, such as bridges, docks and offshore platforms, while its unexpected durability always baffles the construction industry [1,2,3]. Embedding Ag/AgCl electrode into cement-based material as chloride selective electrode (ISE) has a good application prospect. Ueli Angst et al [29] found that Ag/AgCl electrodes can be successfully used in highly alkaline environments, and it is only in the complete absence of chloride that the potential is affected by the pH. It is reported the relationship between response potential and the logarithmic functions of ionic activity range from 10 −4 to 2 exhibits well linear [30]. The objective of the present investigation is to evaluate the performance of Ag/AgCl, as chloride ion sensor, for in situ monitoring of cement-based material under dry-wet cycle condition. By the results presented in this investigation, the efficiency of Ag/AgCl electrode application in practical cement-based material is evaluated
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