Check out a book on mix design by someone called Ken Day. He has developed a mix design method whicxh uses a term called "mix suitability factor".
Can't remember much more at the mo' I'm afraid.
I don't agree with the statement that formwork should be designed for full liquid head. Normal concrete formwork pressures are higher due to the action of vibrator compaction. Compacting with a vibrator reduces concrete yield value to zero, whereas SCC always posesses some sort of yield (no...