[Cob] RE: cob foundation

[Marlin Nissen]

We've found a good hard (surface at least) mix using
''grog" a burnt clay product along with lime putty and
sand...we used if for both our outter finish (survived
the Wisconsin winter in very good condition - even
with some of the wall completely exposed to weather)
and for mortar mix between urbanite chunks........
volanoes optional

Marlin


--- Mary Lou McFarland <louiethefifth at hotmail.com>
wrote:

<snip>

> 
> I'm also fascinated by portland cement options. 
> according to National 
> Geographic the Romans didn't have much luck with
> there concrete/mortar mixes 
> until their empire expanded to places where there
> was a specific kind of 
> volcanic sand.  Their concrete made of this stuff is
> STILL holding up better 
> than modern portland.  There are people out there
> who know more about this 
> than I do but I think the fired ingredient in some
> of the homemade mortar 
> mixes is suppose to act like that volcanic sand. 
> (Is that the pozzolan?)  
> Maybe if you're in the pacific NW you could run up
> to Mt. St. Helens with a 
> pick up and try a few mortar recipes. I'm a little
> short on volcanoes here 
> in Iowa but am thinking about trying different types
> of ash.  This was 
> probably not helpful at all...but ,I do manage to
> amuse myself.  Sorry for 
> the length .
> 
> 
> 
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