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Post by Orange on Jan 18, 2018 3:21:16 GMT -8
I tested 3 types of clay-loam:  in 3 categories: 1. pure clay-loam 2. clay-loam + river sand around 1:2 ratio 3. clay-loam + quartz sand around 1:2 ratio  then I kept dropping and crushing them.. RESULTS: 1. bought clay-loam isn't any different than the one I dig out 2. pure clay-loam is defenetely the strongest (logically since the brick factories use the same) 3. river or quartz sand doesn't make much difference |
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Post by Orange on Jan 26, 2018 8:33:32 GMT -8
more testing thin and thick layers with bricks, from left ot right: 1,2 clay 3,4 clay+fireclay 5,6 clay+quartz sand 7,8 clay+river sand  clay+river sand was the strongest, pure clay and mixed with fireclay were the weakest. |
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Post by Orange on Feb 18, 2018 12:39:19 GMT -8
dried on temps below 400C:  strength test, from weakest to strongest: 1a. loam 1b. loam + fireclay + water glass 2a. loam + sand 1:1 2b. loam + sand 1:3 3. fireclay + water glass 4. black silicone black silicone is the strongest by far. Haven't tried the firecement though. |
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Post by josephcrawley on Feb 18, 2018 14:20:07 GMT -8
This is good info. I use a 3 to 2 sand to fireclay for most mortar and add 1/3 part of water glass per unit of clay for firebox and riser. It has a poor pot life and gels up pretty fast but cures with heat and seems pretty durable.
I have used heat stop a commercial mortar the MSDS says it is silica from quartz and cristobalite plus sodium hydroxide and sodium silicate (aka dry waterglass) it is hell to work with though. Eats your skin up big time.
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Post by Orange on Feb 19, 2018 4:50:24 GMT -8
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Post by pinhead on Feb 19, 2018 7:00:30 GMT -8
That is some very interesting sealant. I suspect, though, it can't withstand direct flame, correct?
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Post by Orange on Feb 19, 2018 9:20:58 GMT -8
sure it can, I had these brick glowing orange  |
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Post by esbjornaneer on Feb 20, 2018 4:39:11 GMT -8
This is good info. I use a 3 to 2 sand to fireclay for most mortar and add 1/3 part of water glass per unit of clay for firebox and riser. It has a poor pot life and gels up pretty fast but cures with heat and seems pretty durable. I have used heat stop a commercial mortar the MSDS says it is silica from quartz and cristobalite plus sodium hydroxide and sodium silicate (aka dry waterglass) it is hell to work with though. Eats your skin up big time. Sodium hydroxide = NaOH = caustic soda is one of the options for making alkaline Geopolymers. Interesting to see that it is used in commercial mortar! |
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