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Worldwide granulated blast furnace slag (GBS) is used as well as a cement constituent as a concrete addition.Also geopolymers are often based on activated GBS.Related to hot metal production and typical slag/iron ratios it can be calculated that about 280 Mio.tons (dry) are produced yearly (2014), 75% of total blast furnace slag (BFS) production.If all BFS would be transformed into the glassy state GBS would cover about 10% of the yearly world cement demand.So it is the most important secondary cementitious material (SCM).GBS offers as well technical and ecological advantages, but also some characteristics.Its latent-hydraulic property is known since 1861.And since the 19th century many researchers tried to find a prediction method for the hydraulic properties, in particular the strength development of slag cements.