A New Method of Evaluating Corrosion-inhibiting Admixtures

Abstract The quintessential standard for evaluating corrosion-inhibiting admixtures and their effects on a cement mix is ASTM(1) C1582. This standard relies on ASTM(1) G109 and ASTM(1) G180 to determine the admixture's impact on corrosion rate in concrete. Unfortunately, these tests come with several intrinsic issues that limit their use and consistency. Notably, ASTM(1) G109 runs for several years and ASTM(1) G180 has an experimental precision of one magnitude. To date, ASTM(1) G180 remains the most favorable test to perform regardless of its inaccuracy because it only requires roughly three days of experimentation. This report will evaluate immersion testing run in similar conditions to ASTM(1) G180 over a longer time frame than standard to ASTM G180. Immersion testing typically yields precise results, and since ASTM(1) G180 already evaluates a metal's reactin to immersion in a test solution, a true immersion test in a similar slutin has the potential to afford comparable results that are easier to understand and utilize while obtaining higher precision.