This European Standard specifies requirements for the chemical and physical properties as well as quality control procedures for ground granulated blastfurnace slag for use as a type II addition in the production of concrete, including in particular cast-in-situ or prefabricated structural concrete conforming to EN 206-1. Ground granulated blastfurnace slag conforming to this European Standard may also be used in mortars and grouts. Ground granulated blastfurnace slag containing any added materials other than grinding aids, is not within the scope of this European Standard. It is also not within the scope of this European Standard to specify provisions governing the practical application of ground granulated blastfurnace slag in the production of concrete, mortar or grout, i.e. requirements concerning composition, mixing, placing, curing etc. As regards such provisions, reference should be made to other European or national standards, such as EN 206-1.