Sawdust cement

Sawdust cement is a thing, though not used in the states. The merits of the material arent really in question here, I'm more so interested in experience with the material and advanced block laying techniques.

I am building a structure, call it a shed, roughly 600sqft.

If I were to make a hollow block mold, and used sawdust cement:

-Do you think any problems would arise from filing the cavities at the end? My main concern being about drying properly.

-Would advanced techniques still apply? Would it be feasible still to not fill each cavity?

I want to go about the mold and hollow block route for material cost, weight and efficiency. I know I can make solid blocks just a easy and avoid this whole question, but I figured it'd be wise to fully work out the possibilities.

Also, I would love to hear about peoples experiences with sawdust cement, in particular Timbercrete. This material isn't in the states and though I've found a great wealth of information on installation, I have nothing to go of off but the directions and I'd really appreciate a more hands on perspective.

Jesse, here are some threads that might interest you:

https://permies.com/t/128390/Wood-frame-sawdust-concrete-wofati

https://permies.com/t/147563/building-type-suit-environment-weather#1152871

https://permies.com/t/52699/Natural-insulation-walk-cooler

I hope you will find what you are looking for.

Jesse, where are you building.
Its it hot and humid drying will be an issue.

My main concern being about drying properly.

But there are steps you can take to help.
- Stack them undercover
- let them dry slowly so cracking is not an issue
- consider shading then at the hottest part of the day
- place them with space between, 3 inches min.
- if stacking put a timber slat in place to separate them
- wind will help dry them