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Lightweight Concrete - Forno Bravo Forum: The Wood-Fired Oven Community

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Forno Bravo Forum Community,

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
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We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Lightweight Concrete

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  • Lightweight Concrete

    I'm thinking of pouring an in place, lightweight concrete chimney (vermeculite). Also, I'm going to apply an insulating coat on my dome with lightweight. The dome is recently finished.
    Any of you with experience care to illustrate the difference in the two mixes. I read the section about this on the website but I'm a little confused, hoping to get a more basic understanding.
    Thanks, JJ

  • #2
    Re: Lightweight Concrete

    Originally posted by dmorgs View Post
    I'm thinking of pouring an in place, lightweight concrete chimney (vermeculite).
    I should imagine it would crumble and fall over.
    The English language was invented by people who couldnt spell.

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    • #3
      Re: Lightweight Concrete

      Vermicrete is not particularly strong and the Portland cement breaks down at around 300C so you are most likely to have a failure.
      Kindled with zeal and fired with passion.

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      • #4
        Re: Lightweight Concrete

        Better of getting an insulating refractory castable, they do make a lightweight 1400c grade material. Not crumbly at all.

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        • #5
          Re: Lightweight Concrete

          Originally posted by Johnny the oven man View Post
          Better of getting an insulating refractory castable, they do make a lightweight 1400c grade material. Not crumbly at all.
          Out of vermiculite?
          The English language was invented by people who couldnt spell.

          My Build.

          Books.

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          • #6
            Re: Lightweight Concrete

            Johnny,
            I had difficulty finding one. What was offered to me as a lightweight castable was almost as dense as the dense castable I use. What is the density and the name of the product you're suggesting?
            Al,
            Vermiculite is only good for 1100 C so it must be different aggregates if it's good for 1400C
            Last edited by david s; 11-10-2011, 02:33 PM.
            Kindled with zeal and fired with passion.

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            • #7
              Re: Lightweight Concrete

              1400c LW is 1050kg/m3, 41% alumina,42% silica,15% cement. I will chase up the content info for you. Product is from Sila. They also make Silalite LW100, which is 1000c rated and is 800kg/m3, this would also do the trick.

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              • #8
                Re: Lightweight Concrete

                Okay then, clear enough I guess. What about the mix for the insulating layer?

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                • #9
                  Re: Lightweight Concrete

                  Originally posted by dmorgs View Post
                  Okay then, clear enough I guess. What about the mix for the insulating layer?
                  Vermicrete would be good for the insulating layer it doesn't need to be strong and won't be subjected to high heat.
                  Kindled with zeal and fired with passion.

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