Win a copy of Grocery Story this week in the City Repair 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:
  • r ranson
  • Nicole Alderman
  • Anne Miller
stewards:
  • Mike Jay
  • paul wheaton
  • Joseph Lofthouse
garden masters:
  • Joylynn Hardesty
  • Steve Thorn
  • James Freyr
  • Greg Martin
  • Dave Burton
gardeners:
  • Carla Burke
  • Pearl Sutton
  • Dan Boone

Wood Ashes Make Cement?!

 
pollinator
Posts: 330
Location: Scioto county, Ohio, USA
75
forest garden hunting cooking food preservation sheep homestead
  • Likes 5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
This kinda blew my mind when I first saw it. I have other uses for it, like making pottery glaze, but this is super cool.

 
Posts: 35
Location: La Bretagne
7
homeschooling solar rocket stoves
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
That was wood ash plus what? It would have been nice if he would have talked a bit through the video.
 
Posts: 947
Location: Graham, Washington [Zone 7b, 47.041 Latitude] 41inches average annual rainfall, cool summer drought
37
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Wood ash plus water, heated in a fire then disolved in water and allowed to absorb it then mixed with fired clay (terracotta)

Uploader suspects sand will also work in lieu of the terracotta but has not tested it.
 
Tiffaney Dex
Posts: 35
Location: La Bretagne
7
homeschooling solar rocket stoves
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Thank you for responding. Sand and ashes seems like a more do-able mixture than broken terra cotta pots. But I'm not sure what need it would fulfill as it would be rather labor intensive. At least the way he did it.
 
Kyrt Ryder
Posts: 947
Location: Graham, Washington [Zone 7b, 47.041 Latitude] 41inches average annual rainfall, cool summer drought
37
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
You could easily scale up to whatever size heating fluid vessel you have to work with
 
pollinator
Posts: 151
Location: SW Ohio
24
duck forest garden fish fungi trees tiny house chicken cooking
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Gotta say, that's some cool beans. I wonder if it would be more practical used as mortar vs fabricating whole objects with just that? One could also use it to make small objects like beads, if it sounds fun but seems too labor intensive for big projects to some folks.
 
Posts: 65
Location: Colorado
dog books woodworking
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Just typed this thread

You should really check it out if you're interested in repeating what Prim did.

Love his channel, but there's a lot missing from this video - and it kinda sucks in that regard.

In a nutshell: The Wood Ash has to be calcined AND rapidly cooled - or it is unreactive and basically just a super-fine filler (which is good for mechanical reasons, but doesn't goo anything together).

And, BTW, NO! Sand does not work in place of his crushed pottery. Sand is super unreactive (unless you've got a very high pH) and is nothing but a filler. Crushed pottery is not only a filler - it's a Pozzolan. Pozzolans are half-reactive.

A Pozzolan!

Do dooo doo doodoo...

A Pozzolan?

Do doo doo doo...

Calco-Aluminosilicates are the bedrock of buildings (quite literally actually....) You got your Alites, and your Belites, your Feldspars, and your Limes....

Again - love Prim, but I've watched the results of his accidental success lead to some sad stuff :(
 
What are you doing? You are supposed to be reading this tiny ad!
Dave Burton's Boot Adventures at Wheaton Labs and Basecamp
https://permies.com/t/119676/permaculture-projects/Dave-Burton-Boot-Adventures-Wheaton
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!