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refractory concrete - Forno Bravo Forum: The Wood-Fired Oven Community

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  • refractory concrete

    Does anyone know of an alternative mix for refractory concrete not using calcium aluminate cement?

  • #2
    Re: refractory concrete

    Flabuck
    The so called 'poor man's mortar' is 1 part portland, 1 part hydrated lime, 1 part fireclay and 3 parts brickie sand.
    This mix is quite 'stickie' and holds the cut half bricks beautifully in place to almost vertical position so is ideal for non-form work dome building. My dome is over 2 years old and has no cracks so I recommend this to all builders. I would not use anything else.
    Check out my build, there are many pics, tips and tricks that I found during my rather quick build, ie. the dome and hearth built in 2 wet days. Then came the outdoor kitchen.

    Cheers.

    Neill
    Prevention is better than cure, - do it right the first time!

    The more I learn, the more I realise how little I know


    Neillís Pompeiii #1
    http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
    Neillís kitchen underway
    http://www.fornobravo.com/forum/f35/...rway-4591.html

    Comment


    • #3
      Re: refractory concrete

      Thanks for the info on that mix Neill,I'll try it the rest of the way.Do you think I could use a similar mix and add either crushed fire brick or river rock to make concrete?I have a guy who wants me to build him an oven and I was thinking about forming the chamber walls and pouring them. Thanks!

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      • #4
        Re: refractory concrete

        You are going to need a castable refractory cement. I am not aware of anyone using a 'home brew' to cast an oven, whether done in sections or as an entire dome.
        Do s forum search of castable ovens, there are several good threads here on the forum from folks who have either cast their ovens in sections or as a whole, but again, they used a premixed castable.

        RT

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        • #5
          Re: refractory concrete

          Any amount of portland based concrete, other than the home-brew mortar between bricks, is a recipe for disaster. A recent thread (of many) on the topic:

          http://www.fornobravo.com/forum/f8/p...vers-8636.html

          Firebricks are cheap in the US. There's no reason not to use them.
          My geodesic oven project: part 1, part 2

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          • #6
            Re: refractory concrete

            Flabuck
            I wouldn't use the mortar mix for a concrete nor as a refractory castable material.
            I used it very successfully for the mortar joints in my Pompeii but that is all I would use it for. No need to use different and expensive refractory adhesives for thinner than 3mm joints and a different one for thicker joints as many of mine went from 1mm to 12-15mm thickness with not one crack as yet on over 2 years. You will need to buy the expensive refractory material to cast an oven dome, or buy one of James's special budget models.

            Neill
            Last edited by nissanneill; 11-09-2009, 03:51 AM.
            Prevention is better than cure, - do it right the first time!

            The more I learn, the more I realise how little I know


            Neillís Pompeiii #1
            http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
            Neillís kitchen underway
            http://www.fornobravo.com/forum/f35/...rway-4591.html

            Comment


            • #7
              Re: refractory concrete

              Thanks for all the info guys it's a big help.I just have one more question.I know how tall an ovens opening should be in relation to the chamber height but what about the width?I am building a 32 by 36 oven (16 inch chamber height) with a 10 inch opening height and would like to make it about 22 inches wide.Would this lose to much heat?Again,thanks for taking the time to respond to my questions.

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              • #8
                Re: refractory concrete

                Hi Flabuck,
                My oven is a 42 inch pompei,, My door is 22 wide... I dont think the width is of too much importance as long as you have your dome height to door height ratio correct (.63) I just wanted to make sure I could slide a big a$$ pan thru the opening...

                Cheers
                Mark

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