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Refractory mortars for the firepit?

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  1. #1
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    Default Refractory mortars for the firepit?

    I was reading a web page about pizza ovens and the sites author was recommending using Dolomite and Magnesium Carbonate [ French chalk] in mortars rather than the more normal slaked lime. Said author stated that such mortars are more heat resistant then ordinary sand and cement mortars.
    Just wondering as I am about to do some self laid bricks etc in the firepit.
    Asking because both ingredients are relatively cheap compared to buying more fireclay.
    "A big boy did it and ran away"

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  2. #2
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    Forget it. I've decided it's in the too difficult basket and I'm selling the firebricks.
    Can't really afford a pizza oven build etc.
    "A big boy did it and ran away"

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  3. #3
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    You can do it on the cheap, by using solid clay bricks and mud made of red clay for mortar. Had a forge lined that way and it worked very well.

  4. #4
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    Thanx Marc but I think that using the tapered concrete blocks will be more pleasing to the eye where the Boss is concerned and we'll stick with the steel or cast iron insert; truck brake drum or washing machine drum as needed, I'll learn to lay blocks as I go.
    https://www.bunnings.com.au/brighton...block_p0028954
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  5. #5
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    So I went to Bunnings to buy some advanced tomatoes for the new bed and they had bigger wall blocks on clearance, so I just bought 42 of them.
    I'll dry stack to see how they fit together and then I'll go and buy a bag of lime for the mortar, assuming that the packing sand will work well enough I'll use what we have there.
    "A big boy did it and ran away"

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  6. #6
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    Still need some advice on mortars but for making my rough block laying more acceptable pretty.
    I have a half bag of refractory here. If I follow the parging recipe I've found which is
    3 sand / 1 lime / 1 fireclay / 1 cement
    As the refractory I have is half grog do I simply leave out one part of sand and use 2 parts clay?
    It's a bucket full of Darley, say 12 kilos, 10 litres.
    Also on another note are there other fillers usable in these stucco mixture that would be more resistant to heat? Say crushed slag, powdered marble or dolomite?
    I only want to sparge this surround once if possible and not have to do it every other year or so
    "A big boy did it and ran away"

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