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Worldwide granulated blast fumace slag (GBS) is the most important SCM due to its beneficial properties.It contributes to low Carbon "green" concretes.Unfavourable are the residual moisture (≈ 10%) of the slag and the wastage of the liquid slags thermal energy (1,7-2,1 G J/ton).The companies Paul Wurth S.A.(Luxembourg) and Siemens AG (Germany)/Siemens VAI (Austria, since 2015 Primetals Technologies) developed 2 different methods for dry slag granulation.The 2 main tasks to be fulfilled are to guarantee the glassy structure of the slag and to achieve a temperature level being sufficient for energy recovery.FEhS-Institute supported both with respect to slag metallurgical questions and its decades expertise on the cementitious GBS proterties.