MEASUREMENT OF CHLORIDE ION CONTENT IN FRESH CONCRETE BY TWO-ELECTRODE METHOD USING Ag/AgCl ELECTRODES

• Published in: Cement Science and Concrete Technology Vol. 78; no. 1; pp. 196 - 202
• Main Authors: YAMADA, Hiroshi, WAKASUGI, Mikio, KANDA, Toshiyuki, AKUNE, Wataru
• Format: Journal Article
• Language: English; Japanese
• Published: Japan Cement Association 31.03.2025
• Subjects: Ag/AgCl electrodes; Calibration curve; Chloride ion concentration; Ready-mixed concrete
• ISSN: 0916-3182; 2187-3313
• DOI: 10.14250/cement.78.196

In this study, we investigated the applicability of a two-electrode method using Ag/AgCl electrodes for the determination of chloride ion content in fresh concrete. We obtained a calibration curve for the amount of chloride ions in fresh concrete applicable from 5℃ to 35℃. As a result of the verification experiment of the calibration curve, it was shown that the chloride ion content in fresh mortar can be accurately estimated regardless of the type of cement, water-cement ratio, and measurement temperature. The two-electrode method using Ag/AgCl electrodes has conventionally been used to measure the chloride ion content of hardened concrete, however this study shows that the method can be used to measure chloride ion content even in ready-mixed concrete.