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Dome Installation Video - Casa / Premio / Modena

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Type S mortar vs Portland cement

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  • Type S mortar vs Portland cement

    refractory mortar recipe 1:3:1:1
    1 part Lime,3 parts sand , 1 part fireclay and ,1 Part Portland.
    Can the Portland cement be replaced by Type S mortar?

  • #2
    Re: Type S mortar vs Portland cement

    Can the Portland cement be replaced by Type S mortar?
    No. Type S is a mortar mix, with aggregates already mixed in with the portland. Adding more aggregates would only leave you with a crumbly mess.
    My geodesic oven project: part 1, part 2

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    • #3
      Re: Type S mortar vs Portland cement

      No.

      Type S mortar is already a mixture of sand, portland cement and lime. You may, however be able to add fireclay to type S mortar to make refractory mortar.

      dusty

      PS - I mixed my own 1:3:1:1 for setting bricks, but after the first day I cut the lime down to 1/4 part. That stuff is DEADLY nasty!

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      • #4
        Re: Type S mortar vs Portland cement

        Thanks !
        How can I find out the percentage of the sand, cement and lime?

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        • #5
          Re: Type S mortar vs Portland cement

          What happened when you removed the lime?

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          • #6
            Re: Type S mortar vs Portland cement

            Nothing.

            But I did't remove it, I just cut it way down. And I used this mix for setting the enclosure bricks, not the oven bricks. For the oven I used store-bought refractory mix. Forno Bravo store.

            BUT, when I asked the guy at the cement store about making my own refactory mix, he sugested that the lime content seemed a bit ridiculous. He wasn't a "refectory expert" but he didn't understand the need for that much.

            dusty

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            • #7
              Re: Type S mortar vs Portland cement

              I forgot to mention that masons quite often add fire clay to their mortar to make it creamier -that is more creamy. He wasn't aware of using it as a refractory additive.

              Hope this helps because it seems to be getting rather confusing.

              dusty

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              • #8
                Re: Type S mortar vs Portland cement

                Originally posted by masuzzu View Post
                What happened when you removed the lime?
                I thought the lime was to give the mix a more "plastic" nature for workability. I used the suggested receipt and found it to work very well - not as good as HS, but the oven still stands.

                Les...
                Check out my pictures here:
                http://www.fornobravo.com/forum/f8/les-build-4207.html

                If at first you don't succeed... Skydiving isn't for you.

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                • #9
                  Re: Type S mortar vs Portland cement

                  Originally posted by masuzzu View Post
                  Thanks !
                  How can I find out the percentage of the sand, cement and lime?
                  Type S ratio is usually 9-2-1 sand-portland cement-lime...the sand will only be mixed in if it is referred to as "spec-mix" or the like...you can find just the mortar mix to which you have to add the sand...you could substitute type N mortar(again the mix only so that you can add sand) which will already be premixed of 1-1 of cement to lime...if it is "spec-mix" type N it will be mixed with 6 parts sand...so see if you can get just the mortar mix...you can then simply mix in one part by volume of fireclay to 2 parts type N mortar
                  Hope this helps!
                  Best
                  Dutch
                  "Making the simple complicated is commonplace; making the complicated simple, awesomely simple, that's creativity. " Charles Mingus
                  "Build at least two brick ovens...one to make all the mistakes on and the other to be just like you dreamed of!" Dutch

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