allen lumley wrote:Troy Fairclough : there are Two major and often conflicting opinions of what makes a good fire brick, Heavy/Dense, and Light F Bricks, add in a confusion of
exactly what 'Fireclay' is - and its major attributes , and it would take several books to begin to be Comprehensive !
A Good source that I send people to www.traditionaloven.com/articles/101/ This explains fire clay, which can be 'cut' with local Clay !
Heavy Fire Bricks - - - - - - - - - - - - www.traditionaloven.com/articles/84/ Note that ovens and kilns use heavy (sometimes both) nearly every time
Light Fire Bricks - - - - - - - - - - - - -www.traditionaloven.com/articles/81 These bricks have a place in RMHs and are my personal favorite
If you goto> the listing of Rocket Stoves 'recent topics' you can scroll down to and click on> "Fake Fire Brick" and then read Erica Wisners Thread Extension
which is nearly comprehensive and more accurate than my earlier posts which contains some errors !
After reading through this material the only thing left to do is find Your preference, you will never go far wrong if you agree with Erica (or Ernie ) Wisner !
There is Also the idea of making the Feed Tube and the Burn Tunnel out of one Monolithic Pour, many people have had good luck with this, you can goto>
the Permies Toolbox at the top right of this page, click on search and do a Permies only search for Articles on Castable Cores, a good search window would
be from 2 years ago to 6 months ago !
-Have you been to rocketstoves.com to download a PDF Copy $15., of "Rocket Mass Heaters'' ? This is 'The Book' that most of the over 100,000
RMHs have been made from ! And I don't make a dime !
It allows us to use a common language to describe the same object and its shapes, dimensions, and characteristics, especially as they then relate to their
assembled partners !
For the Good of the Craft ! Big AL !
Late note : While a Portland cement type should never be considered for inclusion in any part of the RMHs combustion Zone, you are actually near a hot bed
in research in other Cements/Concretes. The Cold Climate Housing Research Center, an arm of The University of Alaska, Fairbanks, is doing much research in
this area, and deserves a look if only because virtually all of your Cement is coming from Korea and China ! A. L.