Schleibinger is one of the leading manufacturer of rheometers for building materials.
A very good survey about rheology but also about SCC you may find at the Ph.D thesies of Dr. Wolfram Schmidt, BAM, Germany:
"Design Concepts for the Robustness Improvement of Self-Compacting Concrete"
Professor Teubert published a fundamental paper about the correlation of rheological measurements and the spread table value, as well about the basic concrete design principles (some years before Okamura in Japan)
You will find a lot of information at the conference reports of the congress in Rheology of Building Materials thats takes place for more then 20 years at the Regensburg University of Applied Science, Germany. Find below reports, of the last years.