Win a copy of Permaculture Design Companion this week in the Permaculture Design forum!
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
permaculture forums growies critters building homesteading energy monies kitchen purity ungarbage community wilderness fiber arts art permaculture artisans regional education experiences global resources the cider press projects digital market permies.com private forums all forums
this forum made possible by our volunteer staff, including ...
master stewards:
  • Nicole Alderman
  • r ranson
  • Anne Miller
  • paul wheaton
stewards:
  • Jocelyn Campbell
  • Mike Jay Haasl
  • Burra Maluca
garden masters:
  • James Freyr
  • Joylynn Hardesty
  • Steve Thorn
  • Greg Martin
gardeners:
  • Carla Burke
  • Dave Burton
  • Pearl Sutton

Red Pottery Clay With Sand for High Temp Mortar?

 
Posts: 23
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Will this work? It's winter and kind of hard to dig up clay. I have some red clay i had gotten for pottery. It seems i could just use that with sand for my hight temp mortar around the combustion unit.
 
Posts: 91
Location: Spokane, Washington
5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator

John Palombo wrote:Will this work? It's winter and kind of hard to dig up clay. I have some red clay i had gotten for pottery. It seems i could just use that with sand for my hight temp mortar around the combustion unit.



Red clay is not the best choice since it is full of iron oxide and has very little silica. The high temps in the combustion chamber will 'reduce' the mortar right out of the joints.
 
John Palombo
Posts: 23
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Even if it is combined with a lot of screened sand?
 
Posts: 3
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
As a potter I would think that the high temps would vitrify your red clay but shrinkage might be a problem making the clay fall out of the joints. The addition of sand or grog would lessen the chances of shrinkage. Having very close fitting joints would also be highly desirable. I would use potter's clay with heavy grog such as clean sand. Some clays might melt at temps higher than 2100 F. Use a high fire clay.
 
Don't listen to Steve. Just read this tiny ad:
September-October Homestead Skills Jamboree 2019
https://permies.com/wiki/118704/permaculture-projects/September-October-Homestead-Skills-Jamboree
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!