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Home made castable concrete recipe? - Forno Bravo Forum: The Wood-Fired Oven Community



Photo Galleries are back! Instructions below.

Dear forum users,
Thank you for your patience with the Photo galleries. We've got your galleries online!
We have finished writing a custom script to migrate the PhotoPlog to vBulletin5’s albums.

Unfortunately V-Bulletin killed the "Photoplogs" in their software upgrade which was unforeseen and we're the first development group to have written a script for getting the galleries back... that said, it took some time to reverse engineer the code and get the albums to move over seamlessly!

Forum users will be able to access their “PhotoPlog” images through their user profile page by clicking on the “Media” tab.
They will also be able to browse other albums by going to the albums page. (On the forum site, there is a link in the black bar beside “Forums” to the albums.)

In order for users to create an album please follow the steps below.
1) Go to user profile page and click “Media”
2) Click Add Photos
3) Enter Photo Gallery Title in the first field
4) Click Upload or Select from Photo Album to add photos
5) Click Post
6) Once posted, the album will be created as a “Topic” on the albums page for the public to see. The topic title will be the “Photo Gallery Title” they created before uploading their photos.

To create this migration path we used vBulletin5’s default album structure. Unfortunately, it won’t work like the “PhotoPlog” but is an album/gallery component on the forum now.
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Home made castable concrete recipe?

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  • Home made castable concrete recipe?

    Hi all, im venturing into the world of pizza oven construction and fire places/BBQ's as a part of my small stone masonry buisness.

    Im looking for a recipe for casting the inner layer of the pizza ovens.

    Heres what i know... A standard fire brick i can purchase contains this:

    Al2O3 (alumina)
    SiO2 (Silicon dioxide, Silica, Quartz)
    FE2O3 - (Iron Oxide)

    And the extra ingredient in a refractory cement is:
    CaO (Calcium oxide,quicklime or burnt lime)

    I have sources for Iron oxide, silica sand and calcium oxide.

    Im just not to sure about alumina and the drying time of using calcium oxide.

    Is it possible to make a mix using:

    Portland cement 30%
    Silica sand 40%
    Quartz 10mm pebbles 28%
    Iron oxide 2%

    What would the cons be not having the alumina content?
    Also info on where alumina would be able to be sourced would be nice.
    Any help on this would be great...

  • #2
    Re: Home made castable concrete recipe?

    Portland cement 30%
    Silica sand 40%
    Quartz 10mm pebbles 28%
    Iron oxide 2%
    This looks like ordinary concrete, with fancy aggregates, and a bit of red colorant. I'm certain that this will fall right apart in contact with direct flame.
    My geodesic oven project: part 1, part 2


    • #3
      Re: Home made castable concrete recipe?

      Alumina is not like a material you buy. It is found mostly in clays which are composed of varying proportions of alumina and silica along with all kinds of other, sometimes undesirable, fluxing materials like iron oxide. You can trial lots of materials and combinations, but I think you are better off sticking to a proprietary castable.
      Last edited by david s; 08-03-2011, 02:25 PM.
      Kindled with zeal and fired with passion.