Influence of Sodium Chloride Solution Amount and Immersion Time on Chloride-Induced Rebar Corrosion using Half-Cell Potential Method

Abstract

The objective of this paper is to study the influence of sodium chloride solution amount and immersion time on chloride-induced rebar corrosion using Half-Cell Potential (HCP). The concrete Samples with a required strength of 21 MPa after 28 days of curing were used. For specimen preparation, a 75 x 75 x 300 mm concrete prism was made. Then, 12 mm steel rebar with various concrete covering was embedded. In this study, different volumes of NaCl solution (3.5% concentration) were applied at 25, 50, and 75% of the height of the specimen. The Accelerated Corrosion with Impressed Voltage (ACVTIV) test was conducted with varying immersion times of 3, 6, and 9 hours. Test results showed that increasing both the amount of sodium chloride solution and the immersion period influenced the HCP growth. From test results, it can be concluded that sodium chloride solution amount and immersion duration should not exceed 50% of the height of the specimen and 6 hours, respectively. In addition, the concrete covering had no significant effect on the area of rebar corrosion using the HCP method.