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[Gene GeRue <genegerue AT ruralize.com>]

> 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.