There's still a lot of discussion about what "right" is. I 'll post my current mixture design with the agsco reference material and the zeeospheres but properly dispersing zeeospheres so that they help rather than hinder is currently a topic of discussion. In general it is my opinion that without some serious additives that using particles this small will be difficult.
The model's result based on my current assumptions and estimated packing density for zeeopeheres is the following. The measured values for zeeospheres are much lower and using them in the model produces designs that aren't going to work. My estimated values are closer to how the system should behave if we can find additives and processes to take care of the issues.
For what it's worth,
My current reference formula suggests the following:
0.329221 Agsco #6 Al2O3
0.180515 Agsco #4 Quartz
0.139481 Agsco #2 Quartz
0.144192 Agsco #2-0 Quartz
0.108832 G800 Zeeospheres
0.097759 G200 Zeeospheres
Predicted density 88%.
The numbers are by volume of solids so take the volume of material you want to make and multiply by the number given. Then take that and divide by the specific gravity of the material to get the weight of that component.
One again, this is where we are on the thread but there are a lot of concerns right now about whether it will work as well as the model says it will. I don't have data on performance for this mixture at present.