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Finding Materials? - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Finding Materials?

    I have been doing a bunch of reading and have decided to use the homebrew mix (3:1:1:1 sand, portland, lime, fireclay) to make the refractory layer in a cast oven. I cannot find hydrated lime locally. would if be safe to use this product as the portland and lime for this recipe?

    https://www.homedepot.com/p/Quikrete...2570/100318484

    Thanks in advance.

    John

  • #2
    If it's 50:50 Portland cement and lime, which it looks like it is, then yeah it'll be fine. You'll just want to do 3:2:1 Sand:mortar mix:fireclay.

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    • #3
      The homebrew mix is really more for sticking firebricks together with though. I don't think the consistency would be right for using in place of firebricks. I'm sure there's a different mix for refractory concrete but I don't know what that is.

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      • #4
        Yes there is a different mix designed for the purpose. Itís called castable refractory and relies on calcium aluminate cement rather than Portland. It is expensive. Using the home brew as a castable does work, probably not quite as good as the proprietary castable refractory, but is really cheap.
        Kindled with zeal and fired with passion.

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        • #5
          Originally posted by Johno4 View Post
          I have been doing a bunch of reading and have decided to use the homebrew mix (3:1:1:1 sand, portland, lime, fireclay) to make the refractory layer in a cast oven. I cannot find hydrated lime locally. would if be safe to use this product as the portland and lime for this recipe?

          https://www.homedepot.com/p/Quikrete...2570/100318484

          Thanks in advance.

          John
          No, those premixed products usually contain lime in the form of crushed limestone (not suitable). If you canít get hydrated lime you may be able to find hydraulic lime which is another suitable alternative.
          Kindled with zeal and fired with passion.

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