Title: Evaluation of AgNO 3 Solution Spray Method for Measurement of Chloride Penetration into Hardened Cementitious Matrix Materials

Author(s): Nobuaki Otsuki, Shigeyoshi Nagataki, and Kenji Nakashita

Publication: Materials Journal

Volume: 89

Issue: 6

Appears on pages(s): 587-592

Keywords: chemical analysis; chemical attack; chlorides; corrosion; electrical properties; nitrites; solubility; Materials Research

DOI: 10.14359/4036

Date: 11/1/1992

Abstract:
Recently, the number of reinforced concrete structures damaged by chloride attack has increased. Therefore, it is important to establish a simple method for measuring chloride content in concrete. Observation of the discolored area after spraying certain indicator solutions on a fractured surface of the specimen has been considered as one of these methods. For example, UNI (Italian Standard) has recommended such a method for chloride contents using AgNO 3 solution. The authors have examined the chloride content at the color change boundary and measured the electrochemical properties of steel bars in the discolored area to clarify the engineering significance of this method.