[Cob] RE: Stone in cob

[Bonnie Morse]

My old Materials Science book from college said that gravel with sharp edges
makes stronger concrete than gravel with smooth edges.  I guess the same
would apply to sand particles in mortar or cob.

Bonnie in OR

-----Original Message-----
From: coblist-bounces at deatech.com [mailto:coblist-bounces at deatech.com]On
Behalf Of Amanda Peck

<snipped>

A propos of not a whole lot, I've been reading a mystery story involving an
earthquake.  Author gives lots of information about earthquakes.  Her point
is that the sizes and shapes of particles in mortar are what is important,
not all the same, and for sure not all rounded.  (Sarah Andrews, Fault Line)