In situ measurement of Cl- concentrations and pH at the reinforcing steel/concrete interface by combination sensors

Analytical Chemistry
Rong-Gui DuChang-Jian Lin

Abstract

This paper presents an in situ, nondestructive method of monitoring Cl- concentrations and pH values at the steel/concrete interface. The Ag/AgCl electrodes prepared by the electrochemical anodization and the Ir/IrO2 electrodes prepared by thermal oxidation in carbonate served as Cl- concentration and pH sensors, respectively. The potentiometric response of the Ag/AgCl electrode to the logarithm of Cl- concentrations ranging from 1 x 10(-4) to 2 M in saturated Ca(OH)2 solution simulating the inner electrolytic medium of concrete shows good linearity. The Ir/IrO2 electrode also exhibits an ideal Nernstian response in the range of pH 1-14. The Ag/AgCl and Ir/IrO2 electrodes were combined into a multiplex Cl-/pH sensor, and the sensor was embedded in concrete close to the steel/concrete interface to realize an in situ and long-term measurement of Cl- concentrations and pH values. The results indicate that the combined sensor is robust and sensitive enough to in situ measure Cl- concentrations and pH quantitatively at the steel/concrete interface, which is of indispensable importance to the study of corrosion and protection of the steel in concrete.

Citations

Apr 8, 2014·Analytica Chimica Acta·Yawar AbbasAlbert van den Berg
May 25, 2016·Talanta·Julia Bujes-Garrido, M Julia Arcos-Martínez
Dec 3, 2020·Sensors·Woubishet Zewdu Taffese, Ethiopia Nigussie
Sep 15, 2009·Inorganic Chemistry·Koichiro TakaoChristoph Hennig

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