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Refractory Mortar Help Needed - Please - 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:
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Refractory Mortar Help Needed - Please

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  • Refractory Mortar Help Needed - Please

    I am ready to start the dome and cannot get the ingredients I need to make the refractory mortar. No hydrated masonry lime (only granular garden type) is available locally and no 1:1 portland:lime mix can be found.

    What I have found is Cement-Lime Type S mix from Holcim which I've determined is 2:1 portland:lime. Two questions. First, can I use this to make my mortar? Second, if I can (hope so!) should I mix it to yield 2:1:1 portland:lime:fireclay (plus the right volume of sand) or 2:1:2 portland:lime:fireclay (plus the right volume of sand)?

    I know the mixture is suppose to be 1:1:1 but would it be better to have more portland (the 2:1:1 mix) or a little less lime (the 2:1:2 mix?)

    Hopefully one of these approaches will work or I'm stuck.

    Thanks.

  • #2
    Re: Refractory Mortar Help Needed - Please

    MP,

    I see no reason why it wouldn't work. I would go the route of using less lime.

    Les...
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    • #3
      Re: Refractory Mortar Help Needed - Please

      Try the second brew (less lime) Portland cement doesn't like high heat so doubling its quantity might be asking for trouble. The extra fireclay could give you shrinkage problems. Try it and see.
      Kindled with zeal and fired with passion.

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