Review of accelerated tests for the induction of corrosion triggered by chlorides in reinforced concrete

Abstract

Reinforcement corrosion triggered by chlorides is one of the main problems that affects reinforced concrete structures. Considering the study of this kind of problem, the speed of data collection, the possibility of controlling the variables that influence the corrosion process and the low cost of carrying out these tests have been encouraging aspects for carrying out laboratory accelerated tests rather than testing based on natural exposure. Over the years, although the procedures adopted in accelerated tests have improved, research in the field is still lacking widely used standardisation. This study undertakes a review of the main testing methodologies used to induce corrosion triggered by chlorides in Brazil and internationally, discussing their advantages and disadvantages and generating a reflection about the standardisation of procedures. Hence, it proposes, among other aspects, the use of accelerated testing procedures that keep a proximity with real exposure conditions, the standardisation of the criteria used to identify reinforcement depassivation, as well as of specimens preparation. These actions can contribute to reduce data variability and facilitate comparisons among similar studies.

Keywords:
Chlorides; Reinforced concrete; Corrosion; Accelerated tests