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Post by Donkey on Jan 23, 2013 18:10:53 GMT -8
What is the material that you used for your walls and the outside of that stove? Is that loam with silica...or...? That is a straw/clay plaster base layer over cob and topped with a clay alis layer. Cob is local, clay rich dirt, sand and long rice straw. Straw/clay base layer is local clay rich dirt made into slip, screened to get the rocks out and mixed with generous amounts of chopped rice straw. To get chopped straw, I run a strawbale through a chipper/shredder.. Alis is a clay based finish. Again, local dirt, screened fine, mixed with fine sand and in this case, some mica powder. The wall itself is light-straw, which is straw and clay slip (local clay dirt) mixed together and packed between forms, then the forms are removed and the wall is allowed to dry completely, finally it's plastered with the plasters discussed above. |
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JJ
Junior Member
Posts: 56
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Post by JJ on Jan 23, 2013 20:59:12 GMT -8
What is the material that you used for your walls and the outside of that stove? Is that loam with silica...or...? That is a straw/clay plaster base layer over cob and topped with a clay alis layer. Cob is local, clay rich dirt, sand and long rice straw. Straw/clay base layer is local clay rich dirt made into slip, screened to get the rocks out and mixed with generous amounts of chopped rice straw. To get chopped straw, I run a strawbale through a chipper/shredder.. Alis is a clay based finish. Again, local dirt, screened fine, mixed with fine sand and in this case, some mica powder. The wall itself is light-straw, which is straw and clay slip (local clay dirt) mixed together and packed between forms, then the forms are removed and the wall is allowed to dry completely, finally it's plastered with the plasters discussed above. Very interesting. This rice straw that you're talking about - we don't have that over here. I just looked it up to see what it was. It's not too "unlike" our straw here. I wonder if it's "stiffer" than our straw here...as our straw here is pretty flimsy... A soil description of where I live - Brookings County, SD: www.docstoc.com/docs/789690/Soil-Survey-of-Brookings-County-South-Dakota From what I understand from my reading... Our soil has redoximorphic properties...and from what I read about what "that" is... zero to nine inches: silty clay and then from deeper... clay with redoximorphic features... a soil property, associated with wetness, which results from the reduction and oxidation of iron and manganese compounds in the soil after saturation with water and desaturation, respectively —note mottles (mixed colors) are common redoximorphic features of soilsdictionaryofforestry.org/dict/term/redoximorphic_featureWith this type of natural clay (all over our property under the top soil) - would it be feasible to construct rocket stove material as well as this final layer that you're describing to me? Or would I have to use store-bought fire clay and/or other store bought materials? It is extremely hard to dig...that's for sure. Last year, we were digging holes for our porch addition...and oh my....hand augging it wasn't fun.... |
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JJ
Junior Member
Posts: 56
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Post by JJ on Jan 23, 2013 21:11:37 GMT -8
I was also looking at the R value of sand and clay....wow. Wow. The R-Value, or resistance value, of a soil is measured in a stabilometer test, and is usually estimated for pavement design. The R-value is the ability of a soil medium to resist lateral spreading due to an applied vertical load, such as tire loads. A range of values are established from 0 to 100, where 0 is the resistance of water and 100 is the resistance of steel. Typical R-values are presented below (from Lindeburg): Clay: 5-15 Sandy Clay: 10-20 Clayey Silts: 20-35 Sandy Silts: 20-55 Silty Sands: 25-70 Sand: 40-75 Gravel: 20-80 Good Crushed Rock: 75-90 geotechnicalinfo.com/r_value.htmlI was watching a video earlier today where a woman was teaching a group of people to put straw bales for the "bulk" of a wall - and then to cob over the straw bales. So I decided to look up the R value of a bale of straw: In 1997, the California Energy Commission (CEC) sponsored their own tests, working with Architectural Testing Inc. of Fresno, California. Two straw-bale walls were built and plastered on both sides: one had bales laid flat, producing a 23”-thick (580 mm) wall, and the other had the bales laid on edge, producing a 16”-thick (400 mm) wall. The walls were then tested in the company’s new state-of-the-art guarded-hot-box (ASTM C-236-style) apparatus. With the bales laid flat, the total R-value was R-26 (RSI-4.6) and, with the bales on edge, the R-value was R-33 (RSI-5.8). On a per-thickness basis, this is just R-1.13 to R-2.06 per inch (0.13 to 0.07 W/m°C). An explanation for these low R-values was provided by researchers Tav Commins and Nehemiah Stone in a paper presented at the ACEEE Summer Study (see page 14 for review of proceedings). On disassembly of the walls following the measurements, the walls were found to be quite wet. Water had been sprayed on the stucco to prevent cracking, and the walls were tested after less than a week of drying. This water was found to have wicked as much as 6” (150 mm) into the wall along the edges of some of the bales. Also, during construction the walls were compressed with polypropylene strapping, which left a 3” (80 mm) gap at the top; this gap was filled with loose straw. Upon disassembly, it was found that there were voids at the top of the wall and very loose packing in places.www.buildinggreen.com/auth/article.cfm/1998/9/1/R-Value-of-Straw-Bales-Lower-Than-Previously-Reported/ |
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Post by Donkey on Jan 24, 2013 14:40:19 GMT -8
With this type of natural clay (all over our property under the top soil) - would it be feasible to construct rocket stove material as well as this final layer that you're describing to me? Or would I have to use store-bought fire clay and/or other store bought materials? It is extremely hard to dig...that's for sure. Last year, we were digging holes for our porch addition...and oh my....hand augging it wasn't fun.... Quite possibly. You will have to run some tests. I've posted how to run those tests several times.. For some reason, the search function isn't turning anything up.. Grrr! I'll have to either find it or re-write it.. Either way, it looks like my time for now is running short. |
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JJ
Junior Member
Posts: 56
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Post by JJ on Jan 24, 2013 23:25:27 GMT -8
With this type of natural clay (all over our property under the top soil) - would it be feasible to construct rocket stove material as well as this final layer that you're describing to me? Or would I have to use store-bought fire clay and/or other store bought materials? It is extremely hard to dig...that's for sure. Last year, we were digging holes for our porch addition...and oh my....hand augging it wasn't fun.... Quite possibly. You will have to run some tests. I've posted how to run those tests several times.. For some reason, the search function isn't turning anything up.. Grrr! I'll have to either find it or re-write it.. Either way, it looks like my time for now is running short. No problem. I was reading some of your past posts today during my free time about the tests. I've found that using google by typing in something like the following helps: loam clay cob site:donkey32.proboards.com It will display threads with only those keywords in them. Learn something new every day eh? I can't get at the clay right now as the frost in the ground doesn't much like that type of thing lol. Our gravel pits that sell it aren't open for another 3 months. It will be interesting. I have found that doing this project...I am learning about a whole new area that I've never explored before and while this is the type of stuff I snored at during high school...it's very interesting to me now. I do appreciate all the time you spend here when you can - so please, do not feel rushed or anything like that. Tomorrow's a new day  |
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dvawolk
Full Member
DSR2 125mm open system (actual project)
Posts: 271
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Post by dvawolk on Jan 25, 2013 0:33:11 GMT -8
Donkey.
If you know some exact sequence of a few words in a thread i suggest:
go to google and insert for example:
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"this exact words to be found" site:http://donkey32.proboards.com
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Those " " should be present! This works MUCH better than searching in these forums! Try it!
Posts should be a few days old to appear in search engine!
Klemen
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