Abstract
Test methods for diffusion coefficient of chloride ions in concrete were published from Japan Society of Civil Engineers in 2004. One method is named 'Test method for effective diffusion coefficient of chloride ions in concrete by migration', and the other one is called 'Test method for apparent diffusion coefficient of chloride ions in concrete by immersion in salt water'. Not only the details of test methods but also mechanisms of chloride ions movement in concrete are explained in this commentary, so theoretical backgrounds of these test methods are easy to be understood. An outline of EPMA method, which is used to determine chloride ions content, are given with an example of measurement. It is refered to how to utilize chloride ions coefficient measured from these methods in a concrete performance verification system.
