Abstract
Concrete chloride ion concentration after curing was compaired between JIS A 1154 method and various simplified methods by using apparatus. The JIS A 1154 method needs three times more than the diameter of the coarse aggregate. JIS A 1154 method also requires at least about a week of time until the results of the chemical analysis comes out. In order to reduce damage to creation, and in order to fasten testing time, various simplified methos were evaluated.