In recent years, concrete durability issues have increasingly gained importance throughout the world. Concrete deterioration mechanisms are commonly related to the adequacy of the protection to steel offered by the concrete cover layer, which is subjected to the action of aggressive agents from the surrounding environment. A number of test methods for the quality assessment of hardened concrete have been developed world-wide. In future, these methods will increasingly be used for design and quality assurance of concrete and concrete structures. In a series of 3 papers, CPI worldwide is discussing current international developments and accepted test procedures. Part 1 of this series concerns common rapid Chloride test methods.