Cob: Clay, replacement of or augmentation to..

[Amanda Peck]

Ah, so I was missing a major natural resource when I lived between TWO 
paving plants in Nashville--the nearest less than 200 yards away.  Bummer.  
Nearest one from here is about 25 miles.  Thanks for the explanation.  
Depending on what kind of rock they started out with, you may indeed be 
getting pug mill clay.  Shale is apparently compressed clay.

I was a little confused by the original explanation.  A quick search on 
fugitive dust indicated that it was the stuff you see in your rear-view 
mirror as you drive down a dirt road, as well as what's left after crushing 
rock.


Bill wrote (snipped):

At the asphalt plant they use air scrubbers to eliminate the air born dust 
problem. The water is pumped through a settling tank before it is recycled 
through the system. When the tank reaches it’s capacity we haul the mud to 
the land fill.

The consistency of this material is more like pug mill ground clay.





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