Announcement

Collapse
No announcement yet.

Mini Forno: The Homebrew mix experiment

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • #16
    Re: Mini Forno: The Homebrew mix experiment

    I make multi sectioned cast ovens for sale and therefore use the best materials I can which includes castable refractory and stainless steel needles, but if I were making one for myself I'd be using Homebrew and cast in one piece over a simple sand castle mould (probably omitting the SS needles they're not mandatory, but do make the casting stronger).
    Kindled with zeal and fired with passion.

    Comment


    • #17
      Re: Mini Forno: The Homebrew mix experiment

      Originally posted by wotavidone View Post
      It is arguable that the FB Homebrew mortar isn't really mortar either, as mortar is defined by the average bricklayer.

      Ordinary mortar, here in OZ at least, is either 3:1 sand:cement, or 3:0.5:0.5 sand:cement:lime. i.e. quite low strength.

      With the homebrew being 3:1:1:1 it is, as pointed out by many a masonry expert on this site, far stronger than traditional mortar, even if the hydrated portland cement loses its chemically ccombined water.

      Anyway, screw the science, many have used it and swear by it and if it fails little is lost -as davids points out, maybe a wekends work.

      Good onya if you would spend the extra few hundred bucks, the original poster stated up front that he was looking to save as much as he could.

      A point of order for anyone who does decide to spring for ciment fondu - beware mixing it with lime, apparently this accelerates the set, making it important to place it quickly.
      Mortar shouldn't be stronger than 4:1
      On placement of calcium aluminate castable it goes off already really fast and that's what makes it difficult to manage. Should only mix half a bag at a time IMO because of this. Any lime added will make it start to go off as soon as you've finished mixing it. Cold water retards it and I always use it in the summer.
      Last edited by david s; 03-31-2014, 06:24 PM.
      Kindled with zeal and fired with passion.

      Comment


      • #18
        Re: Mini Forno: The Homebrew mix experiment

        Actually the “brown rope” will be polypropylene rope added with stainless steel needles (now it will be black rope) see pics

        I have read extensively on this subject...From threads at Forno Bravo, other websites, blogs, discussions with pottery suppliers, potters on fireclay, mortar sand mix, etc. and my own experiments on the subject.

        I will build a 36x48 barrel style oven with the 3.1.1.1 recipe, stainless steel needles and “ brown rope” now black for less than two hundred dollars in material cost (Sand, Portand, Lime and Fireclay).
        The other costs (as each have come to understand) are on reusable materials such as firebricks, blankets, vermiculite, etc.

        The mini forno was only build a few weeks ago, but I have pushed it into well over a 1000 degrees for three to four hours on end ( with help and plenty of kindling) for a few days on and off to see if it will break apart. As the days turned into weeks, it performed beautifully (once it seemed to completely dry) it warms up faster and stays hotter longer – No more cracks, etc.

        I have confidence it will have a long life based on its respected treatment (slow dry times, fiery starts).Based on an average usage of about 26 to 36 weeks a year (stretching it) a homeowner would fire it up (taking into account heat retention for the next day or so to continue the cooking cycle - Which will be an added plus of days to a given year.) and enjoy for many a moon..


        So! Yes! It is well worth it to go the way of the homebrew for those of us to whom wishes to break the status quo.

        PS: I was told in a similar fashion that it would not work, last, on when I wanted to make my own concrete countertops for my kitchen. They have lasted over four years and they still look new; at times they have even been mistaken for granite.

        To all who read this...Don't blink, just do it.
        Last edited by Saovicente; 03-31-2014, 05:37 PM.

        Comment


        • #19
          Re: Mini Forno: The Homebrew mix experiment

          Using this mix for a castable should come with a caveat. That it is a decent low budget alternative to real refractory material.

          One should not expect an apples to apples comparison when it comes to performance, longevity or durability, next to a brick or refractory castable oven. The facts about the materials set the limits, not the ability of the person casting the oven.
          Last edited by stonecutter; 03-31-2014, 06:58 PM. Reason: Word smithing
          Old World Stone & Garden

          Current WFO build - Dry Stone Base & Gothic Vault

          When we build, let us think that we build for ever.
          John Ruskin

          Comment


          • #20
            Re: Mini Forno: The Homebrew mix experiment

            Originally posted by stonecutter View Post
            Using this mix for a castable should come with a caveat. That it is a decent low budget alternative to real refractory material.

            One should not expect an apples to apples performance, longevity or durability comparison to a brick or refractory castable oven. The facts about the materials limit that, not the ability of the person casting the oven.
            G'day
            Fair comment stonecutter...... I think we will never really know except for those who experiment with this stuff. Its not a commercial material, no ones going to make their fortune with this stuff so it will never ever be tested and a standard made. Its up to these guys
            Regards dave
            Measure twice
            Cut once
            Fit in position with largest hammer

            My Build
            http://www.fornobravo.com/forum/f51/...ild-14444.html
            My Door
            http://www.fornobravo.com/forum/f28/...ock-17190.html

            Comment


            • #21
              Re: Mini Forno: The Homebrew mix experiment

              Originally posted by deejayoh View Post
              I do know about that thread. That builder used a rebar frame which is not the same approach being discussed here. I don't see it as the same approach anyway. And there are many more examples of castable ovens successfully built out of refractory cement than homebrew, if you want to cite evidence points. But my main point is that mortar is not a structural material, nor is it meant to be.



              You can build an oven out of a pile of elephant manure and clay, I guess. Up to the builder. But the conversation deserves an accurate assessment of the appropriateness of the material. Personally, if I was going to go to all the trouble of building forms to build a cast oven, I would spend the couple hundred extra to get the right material for the job. But that is just me.
              Where have you been? There was more than one thread about using this mix for casting...I thought you had joined in too.
              Old World Stone & Garden

              Current WFO build - Dry Stone Base & Gothic Vault

              When we build, let us think that we build for ever.
              John Ruskin

              Comment


              • #22
                Re: Mini Forno: The Homebrew mix experiment

                This one got interesting....

                http://www.fornobravo.com/forum/6/di...tml#post163045


                Note my comment about elephant crap in #33...your comment made me remember that thread.
                Old World Stone & Garden

                Current WFO build - Dry Stone Base & Gothic Vault

                When we build, let us think that we build for ever.
                John Ruskin

                Comment


                • #23
                  Re: Mini Forno: The Homebrew mix experiment

                  Originally posted by stonecutter View Post
                  Where have you been? There was more than one thread about using this mix for casting...I thought you had joined in too.
                  As I said, I'm no expert on such matters, so I usually don't chime in on this sort of thing. Just was surprised that those with actual expertise had not chimed in.

                  Funny about the elephant crap comment.
                  My build progress
                  My WFO Journal on Facebook
                  My dome spreadsheet calculator

                  Comment

                  Working...
                  X