Announcement

Collapse
No announcement yet.

foam concrete

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

  • #76
    Re: foam concrete

    Just bumping this thread. I continue to use the foamcrete, but have to admit that I usually use 50/50 volume with vermiculite and perlite mix which makes the mixing process easier. The result is that I end up with a product that is cheaper than vermicrete alone and has less absorbency as well as using less water in the mix, meaning less water to remove. Win/win I reckon.
    Kindled with zeal and fired with passion.

    Comment


    • #77
      Re: foam concrete

      G'day Davids
      What's the stuff like to handle. Vcrete/ pearlcrete a devil to get to do what you want. Get a flat surface for a base or get to stick to a dome. I like the term"Devils porridge" it about sums it up.
      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


      • #78
        Re: foam concrete

        Originally posted by cobblerdave View Post
        G'day Davids
        What's the stuff like to handle. Vcrete/ pearlcrete a devil to get to do what you want. Get a flat surface for a base or get to stick to a dome. I like the term"Devils porridge" it about sums it up.
        Regards dave
        Dave,
        I've mixed up tons of vermicrete so I'm pretty used to it, but have found a few tricks to help it work better. Getting a good working mix is difficult and lots of people add more cement in order to get it to stick together more. This is a mistake if you want it to insulate well as the extra cement reduces the insulating capacity by increasing density and thermal conductivity. The correct amount of water is also crucial. I've found that 1/3 of the volume of vermiculite is the correct amount of water to add ie for every 10L add 3L water. Also a mix of 50/50 perlite and vermiculite works way better than either of them alone. I also throw in a handful of powdered clay for every 10L batch.This helps give it good workability.
        When using foam it takes more careful mixing and it needs to be folded in gently like stirring in egg whites in a cake mix.the stuff needs to be mixed evenly, but if over mixed will start to deflate.
        Last edited by david s; 03-30-2015, 08:30 AM.
        Kindled with zeal and fired with passion.

        Comment


        • #79
          Re: foam concrete

          David,
          I intended to refer back to this thread last night. But, my eyelids got a little heavy. I'm still very interested in your homemade foam generator and the foamcrete. I keep saying to myself that I am going to experiment with it myself. I'm fixin to have a little more time on my hands. Maybe, that will be one of the projects that I get to play with .

          I'm looking forward to more of your experiments with the product.

          Joe W.
          Joe Watson " A year from now, you will wish that you had started today" My Build Album / My Build

          Comment


          • #80
            Re: foam concrete

            Originally posted by Gulf View Post
            David,
            I intended to refer back to this thread last night. But, my eyelids got a little heavy. I'm still very interested in your homemade foam generator and the foamcrete. I keep saying to myself that I am going to experiment with it myself. I'm fixin to have a little more time on my hands. Maybe, that will be one of the projects that I get to play with .

            I'm looking forward to more of your experiments with the product.

            Joe W.
            Joe,
            My eyelids were a little heavy last night too, but I think it was the Prosecco.
            With all the interesting things Italians do with concrete, I'll be renewed with enthusiasm to experiment more with the stuff myself. Thinking of casting blocks of the stuff to carve and recoat maybe. Back start of May.
            Dave
            Last edited by david s; 04-01-2015, 01:48 AM. Reason: Ipad misspelling
            Kindled with zeal and fired with passion.

            Comment


            • #81
              Re: foam concrete

              Hi All,
              I have been following this thread and I'm very interested in the lightweight concrete. I came across this foaming agent recipe on another blog I wonder if this will help you maybe make your own and save some money. David love your generator!
              Chris

              Comment


              • #82
                Thanks Chris,
                I have to admit that I don't always use the foam generator. Because I don't have a compressor I have to drive 600 m to the service station to use theirs. If making a small batch (around 5 litres), i simply place around 10 ml of concentrate, 100 ml water in a 5 L container with half a dozen bits of 6mm aggregate which act as agitators. Screw on the lid and shake the thing for around a minute. It works pretty well, but does not generate as much foam as the compressed air version. The most difficult part is folding the foam into the mixture because it wants to float it takes some time to get the mix consistent.
                Kindled with zeal and fired with passion.

                Comment


                • #83
                  Hi David,

                  I built a foam generator and want to make a perlite/foamcrete insulating hearth. Can you tell me the ratio of water/cement/foam/perlite you have found to be most successful?

                  Thanks!
                  John

                  Comment


                  • #84
                    Hi John,

                    I have found that a 5:1 vermicrete with half the volume of vermiculite replaces with foam does a pretty good mix. But as previously posted it is essential to make sure the foam is well mixed in or you will get inconsistent strength. Using a mixer is likely to lead to deflation of the foam so better to fold the foam in using a narrow and spade. The rest is just practice/trial and error.
                    Kindled with zeal and fired with passion.

                    Comment

                    Working...
                    X