[Cob] roman cement

[Marlin]

Yea, we used Fired Clay (Grog) from a clay supplier here in Wisconsin and it seemed to work great,,,,,,Volcanic Ash is only available in certain areas but plenty of folks have built Roman cement without it  -- - - heard burnt clay is a common additive from everything I've read. Woood ash, I don't believe, has the parts that are neccessary for the Lime to react with it, if it does it might be a weak pozzolan.

Marlin


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-----Original Message-----
From:     Joe Skeesick <joe at skeesick.com>
Sent:     Sat, 5 Jun 2004 22:00:52 +0100
To:       <coblist at deatech.com>
Subject:  RE: [Cob] roman cement


I doubt that wood ash would work as a viable substitute (though I can't say
definitively that it wouldn't) However, here in the UK (as well as other
non-volcanic Roman territories I'm sure) they substituted brick dust/fired
clay for volcanic ash.

J


-----Original Message-----
From: coblist-bounces at deatech.com [mailto:coblist-bounces at deatech.com]On
Behalf Of chris m
Sent: Saturday, June 05, 2004 4:29 PM
To: coblist at deatech.com
Subject: [Cob] roman cement


i have been a lurker for some time now and have found the list to be
informative,helpful,and at times entertaining(wont mention the who) i would
like to ask if hardwood ash (almost exclusively red oak) could be used
inplace of volcanic ash to make a mortar. cobbing in pa  chris


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