whats so different with msc slag based cement

"Slag cement, or ground granulated blast-furnace slag (GGBFS), has been used in concrete projects in the United States for over a century. Earlier usage of slag cement in Europe and elsewhere demonstrates that long-term concrete performance is enhanced in many ways. Based on these early experiences, modern designers have found that these improved durability characteristics help further reduce life-cycle costs, lower maintenance costs and makes concrete more sustainable."


Over 100 yrs of use
http://www.slagcement.org/


my question is, what is so different with the new formula MSC is touting?

Sames to have been around for donkeys years.

my question is, what is so different in the MSC cem