AASHTO T 376M/T 376-17 (2021) PDF Download

AASHTO T 376M/T 376-17 (2021), also known as the "Standard Method of Test for Macrocell Slab Chloride Threshold," provides guidelines for conducting a specific test to determine the chloride threshold concentration required to initiate active corrosion of reinforcing bars in concrete. This method utilizes a macrocell slab specimen, which is a specific type of sample that allows for more accurate and representative results.

The standard outlines the procedures and equipment required for conducting the test. It provides detailed instructions on preparing the specimen and applying the chloride solution to the surface of the concrete. The specimen is then subjected to an impressed current, simulating the electrochemical conditions that promote corrosion.

Throughout the test, various measurements and observations are conducted to determine the chloride threshold concentration. These include monitoring the applied current and voltage, measuring the corrosion potential, and periodically checking the visual appearance of the specimen for signs of corrosion.