jrl
Junior Member
Posts: 101 
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Post by jrl on Jan 23, 2017 12:39:41 GMT -8
Lime plastering is fun! The consistency is a little different than cement mortars. It takes some getting used to, but I find it fun to work with.
For the bells, I used 3:1.5:0.25 ratio of Sand, Lime Plaster, AR Glass Fibers respectively. For the concrete slabs, I used 2.5:1:0.5:0.25 ratio of Sand, Lime Plaster, Portland Cement, AR Glass. So far so good. Now it's just a game of patience to let it all cure before I fire it up. How long do you think it should cure for realistically? Would 7 days be sufficient before first burn? I know Lime takes longer to cure than cement, but how long is appropriate?
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Post by coisinger on Jan 23, 2017 13:28:53 GMT -8
JRL, thanks for the follow up and the pictures. I really like this design, specifically because it is an "All Mortar" stove. No metal involved and very little casting of parts, very easy and simple.
I'm considering using this as a template for a six inch design.
Kudos to you sir for a great stove.
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Post by DCish on Jan 23, 2017 18:34:55 GMT -8
Just registering my kudos to you as well - very nice build!
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Post by randtiir on Jan 31, 2017 2:14:59 GMT -8
Lovely stove! Looks absolutely great.
Just got one quick question as I am currently building my own 4" batch box.
What's the inner diameter of your flue (the metal pipe)? Seems a bit larger than 4 inch.
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kpl
New Member
Posts: 47
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Post by kpl on Jan 31, 2017 3:34:33 GMT -8
Excellent!
So, the riser makes also first bell's rear wall? Or are there two layers of brick at the back?
I would worry about cracking, as riser will get much hotter than other parts of the bell.
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jrl
Junior Member
Posts: 101
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Post by jrl on Feb 2, 2017 9:47:55 GMT -8
Lovely stove! Looks absolutely great. Just got one quick question as I am currently building my own 4" batch box. What's the inner diameter of your flue (the metal pipe)? Seems a bit larger than 4 inch. That is 6" black stove pipe. There is a 7" chimney thimble in the back chimney wall with a 7-to-6 adapter. I could put a reducer on the stove side of the pipe, but seems to run nicely on 6 pipe. I suspect I'm sending more heat up the chimney, but getting better rocketing effect running 6" off the second bell. |
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Post by coisinger on Feb 2, 2017 9:49:07 GMT -8
More JRL...did you finish your plaster job?
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jrl
Junior Member
Posts: 101
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Post by jrl on Feb 2, 2017 9:53:20 GMT -8
Excellent! So, the riser makes also first bell's rear wall? Or are there two layers of brick at the back? I would worry about cracking, as riser will get much hotter than other parts of the bell. The riser is within. There is an outer wall of firebrick. Only cracking I've seen so far is in the outer lime plastering. There are a handful of hairline cracks, that formed before the stove was fired while the plaster was curing, but nothing very noticeable and to me this seems natural with lime plaster. I don't have any stress joints in the plaster like you have with long sections of concrete, like a patio. |
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jrl
Junior Member
Posts: 101
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Post by jrl on Feb 2, 2017 9:58:41 GMT -8
Finished look, so far so good. I added a second layer, about 3/16" of lime plaster with a little Portland cement mixed in for strength. It adds a nice hard shell over the thick layer of plaster beneath.
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Post by coisinger on Feb 2, 2017 9:59:59 GMT -8
Nice!
Any temperature readings, results as of now? How is it behaving?
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jrl
Junior Member
Posts: 101
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Post by jrl on Feb 2, 2017 10:03:07 GMT -8
Nice! Any temperature readings, results as of now? How is it behaving? Haven't hooked up a thermocouple yet to chart it. So far I haven't gotten the surface temp of the stove pipe above around 175 degrees. The surface of the 1st bell has gotten up to 235 degrees when running two back-to-back loads of wood. |
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Post by pigbuttons on Feb 2, 2017 20:44:53 GMT -8
very nice job. Thanks for posting.
This project finally got me to register so I could answer your question on fiber to use. I know you are done but in the future or for someone else it might be of value. If you go online, or have access to a full service concrete products supplier, you can find polyester fiber for use in concrete. It is about 2" long fine fibers used to prevent drying cracks. It does not add strength or prevent stress cracks. Make sure that you add it by rubbing it between your hands so the fibers separate into individual strands or they will remain clumped up and form weak spots. Also don't use it if you plan on using standard stains with VOCs as the fibers will fuzz up on the surface.
As for the waiting time before firing, it's too late now, but, Portland Cement takes about 21 days to get 90% strength. Lime is even slower. But since you aren't using if for compressive strength you can probably fire it as soon as it stops changing color. And one more thing, all of these cement products except refractory cements need to stay moist for at least 10 days so that they can fully cure. It takes a lot of water over time to fully cure.
Hope this helps.
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Post by randtiir on Feb 7, 2017 1:36:26 GMT -8
Lovely stove! Looks absolutely great. Just got one quick question as I am currently building my own 4" batch box. What's the inner diameter of your flue (the metal pipe)? Seems a bit larger than 4 inch. That is 6" black stove pipe. There is a 7" chimney thimble in the back chimney wall with a 7-to-6 adapter. I could put a reducer on the stove side of the pipe, but seems to run nicely on 6 pipe. I suspect I'm sending more heat up the chimney, but getting better rocketing effect running 6" off the second bell. Thank you for replying! I shall have to test mine with 5" pipe, we'll see how it goes. Though, I reckon a larger stove pipe should give *more* heat to the room, as gas flow slows down in the larger pipe, allowing more time for heat transfer. You've done a great job with the finishing, looks absolutely beautiful with the plaster. I will have to show this to the family if they express doubt in rocket stove aesthetics. |
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Post by pyrolyse on Feb 14, 2017 14:41:43 GMT -8
That's a nice little stove. Could we perhapse see a run? As you know, I am interested in briquettes and their performance in Batch Boxes.  |
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jrl
Junior Member
Posts: 101
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Post by jrl on Feb 22, 2017 12:42:48 GMT -8
That's a nice little stove. Could we perhapse see a run? As you know, I am interested in briquettes and their performance in Batch Boxes. I'll try to take a video of it running. It runs very strong and consistently on the compressed fuel. |
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