Has anyone modified the regular Quikrete Mortar Mix by adding fireclay to make an acceptable refractory mortar mix? If so, how much fireclay to add per 60 pound bag?
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Re: QUIKRETE Refractory Mortar Mix
It would be a difficult task to do so...the mix you refer to is a type N mix which would mean equal parts of cement and lime to approximately 6 parts sharp sand...however I think there is an acceptable range for sand content that might increase that amount to over the 6 parts that is customary...very hard to figure out how much fireclay to add and one probably could not tell by sight or feel unless they had been working with such products for a long, long time...a place that carries fireclay should carry type N mortar which would be premixed hydrated lime and cement in a 1/1 ratio...you would then be able to add the fireclay and sand...
Hope this helps!
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

Re: QUIKRETE Refractory Mortar Mix
Yes type N mortar with fireclay works great and would probably work best. 5 parts N and one part fireclay is the correct formula for fire mortar 1 1 3 1 .Type S has twice as much lime in it for a 1 part portland 2 parts lime and 3 sand. Adding one part fire clay would give you a 1 2 3 1 formula. Type S is rated for underground wet areas. For a 60 lb bag of mortar I think you would need about 12 lbs of fireclay.Last edited by rlb444; 01052009, 09:24 AM.
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Re: QUIKRETE Refractory Mortar Mix
Originally posted by rlb444 View PostYes type N mortar with fireclay works great and would probably work best. 5 parts N and one part fireclay is the correct formula for fire mortar 1 1 3 1 .Type S has twice as much lime in it for a 1 part portland 2 parts lime and 3 sand. Adding one part fire clay would give you a 1 2 3 1 formula. Type S is rated for underground wet areas. For a 60 lb bag of mortar I think you would need about 12 lbs of fireclay.
Add one part portland cement, one part fireclay, 5 parts type S?
Or add 1 part cement, 2 parts fireclay, 1 part type S mix, 3 parts sand?Or, does the type S mix already contain enough sand to cover this?
...Or am I just way off base here with a neophyte brickie quiestion? I will probably have some extra type S from another concurrent project, is why I ask.
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Re: QUIKRETE Refractory Mortar Mix
I think rlb has it backwards...there is less portland cement in type N than type S...type N for general building consists of 1 part portland 1 part lime and 6 parts sand whereas type S consists of 2 parts portland 1 part lime and 9 parts sand...if you have the the type S mortar(without the sand) as opposed to the mortar mix(already has the sand in it and you just have to add water) you might be able to mix an extra half a cubic foot of hydrated lime with one cubic foot of type S mortar and the 3 cufeet of sand and 1 cu of fireclay to be pretty close to the 1311 recipe...if it is the mix it will be much tougher to do...IMHO
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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Re: QUIKRETE Refractory Mortar Mix
Thanks for the feedback... That makes more sense. It is the mix, not just the mortar. I will probably go ahead and buy fresh materials and mix from scratch. I'm sure I will find a use for the mix I have, what with the variety of masonry projects I have going on simultaneously.
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Re: QUIKRETE Refractory Mortar Mix
Jamie
Another word to the wise...when you get the sand for the oven mortar(refractory) try to get the sharpest or finest sand possible...it will make for a nice workable and smooth mortar for those tight joints...if you are bricking the enclosure or for the outer arch it is not such a big deal
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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Re: QUIKRETE Refractory Mortar Mix
Thanks for the correction Dutch. Yes type N is approx 1 portland, 1 lime, and 3 fine sand. Type S is approx 2 portland, 1/2 lime, 4 coarse sand. I find that the formulas vary depending where you look esp with the sand content. In building my oven I found that the type N mixed 5 to 1 with fireclay works much better than the S mixed 5 to 1. Working with type N is smoother and so is the finish.
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Re: QUIKRETE Refractory Mortar Mix
I call it creamier...a mason friend of mine always said use type N unless there is some very specific reason to use something else...a mantra I have tried to remember
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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Re: QUIKRETE Refractory Mortar Mix
Originally posted by MAVANO View PostOk let me get this, type N mortar mix is 1part portland 1part lime is it 3 or 6 parts fine sand
Best
Dutch
P.S. As far as I know the Quikrete masonry mortar mix(the just add water type) in Lowe's or Home Depot would be with 6 parts sand"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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