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Title: Multi-Laboratory Validation Study of Critical Chloride Threshold Test Method

Author(s): Goran Adil, Ceki Halmen, Pavan Vaddey, Jose Pacheco, David Trejo

Publication: Materials Journal

Volume: 119

Issue: 6

Appears on pages(s): 91-100

Keywords: chloride; corrosion; critical chloride threshold; service life prediction; standard test method; threshold

DOI: 10.14359/51737195

Date: 11/1/2022

The critical chloride threshold, Ccrit/, is a value of a reinforced concrete system and the critical parameter that is used to define the initiation of reinforcement corrosion and is used for service life predictions. The published Ccrit/ data in the literature shows significant variability due to the lack of a standardized laboratory test that can consistently be used by the industry and researchers. This paper reports data from a multi-laboratory validation study of a novel Ccrit/ test method, developed based on a framework established by ACI Committee 222. The study was conducted using the same set of materials in three different laboratories, and its repeatability and reproducibility were evaluated. Results indicated that the mean Ccrit/ values were not statistically significantly different. Exhibiting good repeatability and reproducibility, this test method should be further evaluated to be implemented as a standard laboratory Ccrit/ test method.