Creating a Refractory Mix Out of AirCrete for the Rocket Mass Heater 

I was thinking the same thing !

@@carpenterfamily6198 My wife is the exact opposite.... Except when it's a project for her...

Agreed. I almost hate him for that. 😅🤷

I've been trying for years to get my husband interested in my rocket stove project, Doh.

We installed a "regular" wood burning cook stove, and it is a real blessing. It saves on propane and electric expenses, but it is a lot of work. Answersfromgod.com/?youtube=NcVlb-z6Y94

Where did you watch it ?

You are welcome!

Thanks for free information...great job,..

If this is working right it will get way to hot for normal cement. Cement disintegrates at about 1000 F The riser in the stove can reach 1900. Nearly double the 1000 degrees of a pizza oven.

@@ghz24 ... Yes in part. I have a steel angle iron in my brick oven that deformed slightly in the heat. I take this to mean the top of the pizza oven reached close to 1900F. Still, even with that heat, the portland/clay mortar joints between the oven's red clay bricks have not been affected. Disintegration certainly has not happened. By comparison then, for a rocket mass heater, a well designed, heat resistant firebox is necessary, but adding clay to concrete mix for the mass - often benches - will be adequate to sustain the high temperatures

Try adding some graphene to the silicate mix. Expensive but impressive results. Other components work to boost refractory performance as well.

“If a riser has a catastrophic failure, it can drop materials into the burn chamber and the active flame comes out the inlet of the RMH. It happened to me and luckily I was sitting here there and I had plenty of water from my aquaponics system to extinguish the flame.” And this is the problem. The idea is awesome. But Paul Wheaton doesn’t seem willing to admit the flaws. You cannot get insurance on your house for this reason. Codes will not allow the RMH for this reason. They are being built by AMATEURS which is fine, but there is no accepted design parameters, no UL testing. It’s an awesome thing, until it isn’t.

Awesome! Can you give a good refractory recipe? I see none here.

@@brucea550 these things are slowly changing thankfully. There are stoves getting approval that can be run through a mass. The legal one I know right now is like $2500, which is a lot. But if you have an expensive home it's worth it to get insured

@@priestesslucy3299 I’m not sure what you mean about stoves that can be run through a mass. The system has to be designed as a system, not a factory woodstove and a home built mass. Could you maybe mention a source for what you know of? I do know there are companies making the actual prefab riser that you can buy for your RMH fabrication, but still not a complete UL system that will satisfy codes or insurance underwriters. I’d LOVE to find one! Paul W. makes ‘I know of a guy’ comments but never any actual facts or sources. Even if you have a non-expensive home, having homeowners insurance provides you with liability protection if, for example, someone gets hurt on your property. It’s not just about ‘if the house catches fire’. All these uninsured folks are living on ‘a wing and a prayer’, and their only protection from potentially getting sued is their own poverty- can’t get blood from a turnip. It’s also highly irresponsible putting these experimental heaters in occupied spaces where people sleep. Please don’t misunderstand, I think experimental stuff is great, and I have now built an RMH in a detached garage, with the firebox separated from the rest of the structure by a concrete wall. So far I like it. But it’s clearly experimental, and I wouldn’t put one in my house.

@@brucea550 Liberator is the one I know that's available and legal now.

I have been pondering several ideas myself .. I hope that he can publish your ideas !!

My husband told me that and I didn't believe him. Had to go look it up, but you are right!

@@dirtpatcheaven We could have roads and driveways that would last forever if we used it today.

Could you elaborate for a dumb blonde trying to understand?

@@priestesslucy3299 which part?

Post cure is good practice. May I suggest you try graphene in one form or another. It does not take much. Might mix graphene with silicate and post fire/cure that way. Thanks.

WHERE CAN I PURCHASE, AND IS THERE A SPECIFIC GRADE OF GRAPHENE WOULD YOU RECOMMEND? ANY INSTRUCTIONS? THX.

so what if you did add some clay...even better?

SKPChick 31 YES, I AGREE! HE SHOULD PATENT IT RIGHT AWAY! !!!

SKPChick 31 provisional is easy and gives time to make a full patent

Well, I thank him for thinking in the future and sharing for free. Our world is moving in a new direction, freeing us with technology... you may want to look into blockchain technology, it is the way of the future for contracts of all kind$.

they invented a plastic in the eighties that could take an acytiline torch they could have dipped the entire shuttles into they didnt award the contract to the man and ruined his life

Getting a patent is easy. Showing that your admixture remains stable over time and does not fall apart is a different thing. Building new system might be easy for some. Building something that lasts and does not show material defect with the passage of time is a different thing. As the saying goes in the advertising business: "-Charlie, we don't want a tuna with good taste; we want a tuna that tastes good!"

Exactly.. 5bags later and materials plus time... might as well buy a 4500 efficent rated stove

@@vanderumd11 but where's the fun in that? ..not to mention, 5 bags for 1 rocket stove? Will you be flying it to the moon? Considering the mix, I was thinking maybe ½ a bag would make a nice sized rocket stove..

Hi Elizabeth Unfortunately Portland cement desintegrates @~ 550 degree C You could saturate the cement based riser with water dilluted waterglas (sodium silicate) When the cement desintegrates and looses it's structural integrety, the waterglas would keep the riser pipe in shape. A clay liner within above mentioned riser pipe is not a bad idea at all. I suggest you to mix the wet clay with perlite or charcoal or saw dust or expanded clay to reduce cracks. Important.. allow enough time for drying and curing.