What is the concrete mixture for a poured wall and the ferrocincrete walls?
What is the aggregate size for the ferroconcrete?
Don, ferrocement uses only sand and cement. I mix it at three parts
sand/one part cement. Use the cheapest sand you can get; the screen sizes
of sand vary from very fine to rough. For ferrocement the rougher stuff,
which is less expensive, works fine.
For footings and poured walls I use three parts gravel, two parts sand, one
part cement.