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vermiculite mix? - Forno Bravo Forum: The Wood-Fired Oven Community

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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

Ask Me Anything New Forum Feature

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:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

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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vermiculite mix?

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  • vermiculite mix?

    I added sand to my portland cement and then added my vermiculite, I'm not sure if this was the correct way to mix? It's been 3 days and it has not dried yet and is very soft and brittle. Should I rip it out and just add the portland to the vermiculite?

  • #2
    Re: vermiculite mix?

    Sand isn't a good idea because it will reduce the insulating properties of the vermiculite, but it shouldn't make a difference in hardening. To the portland, the sand is just another aggregate. I'd wait a week before making any decisions. What proportions did you use?

    Hey, Kenilworth is just next door to me. Welcome.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: vermiculite mix?

      I used 20 parts sand to 1 part cement for my mortar mix then i mixed the 5 vermiculite to 1 portland. Idon't really want to rip it out, but i will if i have to. Do you think i will loose much heat?
      Thanks for your help

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      • #4
        Re: vermiculite mix?

        If I am reading this correctly, your end result has very little portland cement.
        Basically you have done a 25-1 ratio (aggregate to cement). At this ratio I would be concerned about strength as well as the diminished insulation value.

        Sorry, I have to ask, WHY did you add the sand? where did you get the idea to make a 20-1 mortar as the starting point for your vemiculite concrete? Just curious....I'm pretty certain it was not from anyone on this forum.

        RT

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        • #5
          Re: vermiculite mix?

          Way too much sand. The correct amount = none. The vermiculite substitutes for the aggregates in concrete, not adds to them. I'm not surprised it isn't hardening.

          Sand (or gravel or broken glass) isn't an insulator. You don't want it in your insulation layer.
          My geodesic oven project: part 1, part 2

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          • #6
            Re: vermiculite mix?

            I don't think it's going to set.
            James
            Pizza Ovens
            Outdoor Fireplaces

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