Gerard,
A concrete weekly email sent me to this website this morning, http://www.epa.gov/epawaste/partnerships/c2p2/ . Nothing that can be copied and pasted, but some background.
The slag mix we used is about a 1/3 replacement of Portland cement with NewCem from LaFarge. AFAIK, it behaved like our regular structural SCC mixes.
HTH,
Jim