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From what I've read you should avoid portland cement in the mortar mix but use calcium aluminate. Calucem the manufacturers of Lumnite gave me the following mix. 2 sand; 2 Calcium Aluminate; 1 Fire Clay; I used this for the chimney because I ran out of Refmix.
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www.fornobravo.com/forum/f2/high-heat-mortar-mix-questi...
www.fornobravo.com/forum/f2/high-heat-mortar-mix-question-2258.html
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If you don't want to worry about shipping RefMix, or want to save money, you can make your own mortar, using either fireclay and Portland cement or fireclay and Calcium Aluminate. Fireclay is a heat resistant clay made up of aluminate and silica. ... 1 part fire cla...
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www.fornobravo.com/pompeii_oven/high_heat_mortar.html
www.fornobravo.com/pompeii_oven/high_heat_mortar.html
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Mixing send into a wet clay by walking in it, or mixing sand with clay both in dry form and then adding water in, ... Fire clay sand mortar mix dries very slowly, but if you support the side walls by pouring concrete cladding behind them, leave it cure and then form arched ceiling using the 50:50 fireclay:sand mortar is the...
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www.traditionaloven.com/articles/101/what-is-fire-clay-...
www.traditionaloven.com/articles/101/what-is-fire-clay-and-where-to-get-it
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Fireclay based mortar is very good in heat. Mix dry ingredients first, and then add gradually water while mixing - all by hand. After it's mixed leave the mud untouched for 10 minutes and then give it a quick remix - at this second mixing stage you might need to add just a little water in to improve consistency.
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www.traditionaloven.com/wwwboard/messages/3189.html
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Mortar, 90% Al2O3, wet, heat set, phos bond, GREENSET-94-P. Mortar, fireclay, cement bond, air set, water resistant, MORTAR MIX 413. Mortar, fireclay, dry ...
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www.naref.com/products/standard_stock.html
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Do NOT use as a mortar in residential fireplace construction. This product no longer meets building codes for residential fireplace construction. Please ask for FIREPLACE BULLETIN: Refractory Mortar Standards and Specifications for appropriate alternatives...
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www.alsey.com/dry_milled_fireclay.htm
www.alsey.com/dry_milled_fireclay.htm
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This product works particularly well for replacing broken firebrick, refilling old mortar joints, repairing broken or chipped clay flue lining. "Flue Glue" is available in 5 lb pails. Fire Clay is sometimes used as a component to make a refractory mortar using the following or similar formula: 1 part Portland cement;
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www.sandkuhl.com/html/chimney_products.html
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Buy a bag of mortar clay (sometimes called fire clay) and mix that into the mortar mix. The bag will usually have a suggested ratio of cement, sand and clay. All mortar is "heat resistant", the addition of the clay makes this mix less prone to cracking and crumbling due to the temperature swings.
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ths.gardenweb.com/forums/load/firepl/msg1021301831381.h...
ths.gardenweb.com/forums/load/firepl/msg1021301831381.html
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Many fireplace masons are not familiar with refractory mortar, or they confuse it with fireclay mortar. Masonry fireboxes are often laid in ordinary Portland cement mortar, sometimes with a little extra cement in it or perhaps with some fire-clay added to make it "fire-clay mortar".
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www.rumford.com/articleRefmortar.html
www.rumford.com/articleRefmortar.html
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