"metakaolin clearly beats both flyash & slag from a pozzolanic...

"metakaolin clearly beats both flyash & slag from a pozzolanic reactivity perspective - which is what you need from a SCM."

And here is when i mention metakaolin isnt a waste product (i doubt its actually "greener" having to mine it and ship it than straight cement) and isnt what you need from an SCM, what you need is for it to be cheaper than binder (cement) and close by (logistics).

its just another theory mix that will never actually work ( eggshells, rubber, plastic, forks and chinese pigs )... there is literally thousands with all manner of different Compositions that researchers love to dream up

The best way to green the industry is as i said in the clinker production stage, there is already several advancements in this area that actually work.