Win a copy of For the Love of Paw Paws this week in the Fruit Trees 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

AAC block for RMH?

 
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I'm planning to build an RMH to heat a greenhouse I've built. My home is built with AAC (Autoclaved Aerated Concrete), a type of insulating concrete block widely used in Europe and Asia but virtually unknown in the US. It is made by adding aluminum filings to curing concrete; the aluminum reacts with the lime in the concrete to create hydrogen bubbles, which get trapped in the concrete, which produces a lightweight concrete block with excellent insulating qualities. It's like a man-made pumice stone; the blocks actually float in water. The block is easily worked with regular wood tools.

I have a bunch of it left over from building the house, and I'm thinking they may be excellent for use in the hot areas (burn tunnel and heat riser). Has anyone ever used this or similar materials? Does anyone have any thoughts on how they might work? They are similar to kiln firebrick, though much less crumbly, and they take plasters well.

At any rate, I will try it for the combustion area (unless someone gives me a good reason why it's a bad idea) and let you know how it works!
 
Posts: 618
Location: Volant, PA
27
goat forest garden fungi trees wofati woodworking
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Bubbles can be dangerous when heated, if the air in the bubble has water it will become steam and steam is too large for the given area the water was housed in.so be absolutely sure they are bone dry, even cook them in the oven first to dry them further.
 
gardener
Posts: 2484
Location: Cincinnati, Ohio,Price Hill 45205
179
forest garden trees urban
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
I believe Satamax uses this product, but not in contact with flame.
If it is still Portland cement , it will not be durable in contact with flame.
Use it behind a " hot face" of firebrick splits.
 
Your mind is under my control .... your will is now mine .... read this tiny ad
Switching from electric heat to a rocket mass heater reduces your carbon footprint as much as parking 7 cars
http://woodheat.net
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!