I came across this recipe for castable perlite insulation and thought about giving it a try to insulate a heat riser made from stove pipe with in hopes that once the thin stove pipe burns up the cast refectory will be strong enough and last for many many years. I have my doubts that this mixture would be strong enough but maybe insulated fire bricks could be made for the burn tunnel as well. www.myheap.com/book/chapter-01/irc/irc.php
There are a lot of different recipes that i have found some contain calcium aluminate cement, I'm hoping to find a way to make insulating fire brick from clay i can find in the ground and sawdust. Some of the test bricks that i have made from clay and saw dust have good insulating properties but are quite fragile I'm making a rocket heater with a out of sawdust and dirt with a consumable liner, my hope is that the saw dust will burn out of the first inch or two which will provide enough insulation to prevent the rest of the sawdust from burning out so that there is still good strength to the outside of the stove. I'll post some pictures and stuff i don't think that the heater will be ready for at least a month tho because of how long it takes the sawdust and dirt to dry.
Last Edit: Mar 25, 2010 20:02:50 GMT -8 by spacevan
Right on spacevan! Donkey has done quite a bit of experimenting with this too. Have you seen his older threads on the subject? I seem to remember one called "tapered heat riser"? but check back through the threads and you'll find a bit of info he's shared.
I found an article describing the results of different home made fire brick using clay as a binder. The amounts used, there effectiveness of insulating and also the effect they have on the temperature of the fire are charted out. I found the article to be interesting and a good starting point for trying to come up with ways to make a durable rocket heater with out the use of fire brick. Where i am from fire brick is almost impossible to find except the 1.25"x4"x9" fire brick for lining wood burning stoves. Canadian tire charges $6.00 a brick so that is way to expensive the make a rocket heater core out of. The link for the article is www.hedon.info/InsulativeCeramicsForImprovedCookingStoves
Last Edit: Mar 30, 2010 14:54:15 GMT -8 by spacevan
Daryl: @ Eric, I need to burn something soon. I have a growing pile of branches.
Jun 9, 2015 12:05:50 GMT -8
ericvw: If I wasn't married Daryl I'd call that a date!
Jun 11, 2015 16:59:25 GMT -8
ericvw: JK of course....
Jun 11, 2015 16:59:54 GMT -8
Daryl: Ha! No worries. Almost all of my online friends are married. So it's cool. I get it's all in fun. By the way, I have a date tomorrow and I will need to remember to check out his stacks. *giggles*
Jun 12, 2015 4:49:55 GMT -8
Daryl: By the way, Happy Friday!!!
Jun 12, 2015 5:08:17 GMT -8
ericvw: Dating? Good for you, girlie... Now it's Monday- How'd it go????
Jun 15, 2015 15:57:11 GMT -8
Daryl: It went well, thank you. Are you doing a garden this year?
Jun 16, 2015 4:46:15 GMT -8
Daryl: Glad I own a kayak. 5 straight days of rain.
Jun 16, 2015 9:06:27 GMT -8
ericvw: Been thinking about some outdoor container deals, but hey- it's June 17th already!!!
Jun 17, 2015 17:26:29 GMT -8
Daryl: This summer is going fast, Eric. A shout out to Donkey and his cool sculptures.
Jun 19, 2015 4:29:42 GMT -8
ericvw: Satamax needs an American girl, Daryl- unless you're dating life is above stellar!!! He's got a big pile of bricks to play with.....
Jun 22, 2015 17:01:03 GMT -8
Daryl: There you go again, Cupid. Hey, I call him my French boyfriend. What else do you want?
Jun 24, 2015 2:36:00 GMT -8
ericvw: Just like giving you a little ribbing!
Jun 24, 2015 14:50:26 GMT -8
Daryl: Speaking of ribs, this rain needs to stop so I can smoke some food. I'm half tempted to purchase a vertical smoker for the porch.
Jun 30, 2015 14:49:42 GMT -8
Daryl: I know...*gasp* purchase a stove.
Jun 30, 2015 14:50:07 GMT -8
ericvw: Do it, Daryl! Hey, where is Matthew Walker???
Jun 30, 2015 17:51:05 GMT -8