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  #61  
Old 04-27-2011, 05:52 PM
Journeyman
 
Join Date: Aug 2010
Location: Glendale, Arizona
Posts: 397
Default Re: High Heat Mortar Primer

Hi Jacktheknife,

Mortar is "sticky" so it holds to bricks. You also want the mortar to be "weaker" than the brick so if there is any cracking it is at the joint and not through the brick. If you want maximum effect of thermal mass then either cast a dome out of castable refractory or cut each brick so the mortar joint is very tight. Also, note that manufacturers sell mortar and castable refractory products but never recommend that they be interchanged.

Cheers,
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  #62  
Old 04-27-2011, 08:53 PM
david s's Avatar
Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,855
Default Re: High Heat Mortar Primer

There seems to be some confusion here.
1. Cement is the powdery stuff that sticks the other materials together.
2. Concrete is the mix of cement with water, fine and course aggregates.
3. Mortar does not contain course aggregate- fine aggregate only (usually sand)
4. Castable refractory contains, among other things, both calcium aluminate cement and aggregate which is generally too course for mortar.

Last edited by david s; 04-29-2011 at 01:44 AM. Reason: forgot to add water
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  #63  
Old 04-27-2011, 09:16 PM
Serf
 
Join Date: Apr 2011
Location: texas
Posts: 15
Default Re: High Heat Mortar Primer

Gentlemen,

I never realized mortar is sticky or that it is not so course as 'concrete'
{not cement} I understand now why mortar is for bricks and concrete isn't.
I also never knew there is a refractory mortar as well as a refractory cement.



Thank y'all a lot!


J. Winters von Knife
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  #64  
Old 04-28-2011, 05:57 AM
Tscarborough's Avatar
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Join Date: Oct 2009
Location: Ausitn
Posts: 3,128
Default Re: High Heat Mortar Primer

Concrete and mortar are not the same. They do not share the same desired physical properties. Both contain similar ingredients, but that is the only similarity.
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  #65  
Old 05-07-2011, 09:35 PM
Serf
 
Join Date: Oct 2009
Location: Australia
Posts: 10
Default Re: High Heat Mortar Primer

Hi from Oz,

We have several different sands to choose from here IE river, course and fine and also brickies loam, can someone tell me which I should use please?
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  #66  
Old 05-07-2011, 09:46 PM
david s's Avatar
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Location: Townsville, Nth Queensland,Australia
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Default Re: High Heat Mortar Primer

What is the mixture you are trying to make?
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  #67  
Old 05-07-2011, 11:43 PM
Serf
 
Join Date: Oct 2009
Location: Australia
Posts: 10
Default Re: High Heat Mortar Primer

Just the mortar for the dome, 3:1:1:1
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  #68  
Old 05-08-2011, 02:13 AM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,855
Default Re: High Heat Mortar Primer

I use fine silica sand
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  #69  
Old 05-08-2011, 02:38 AM
brickie in oz's Avatar
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Location: Whittlesea
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Default Re: High Heat Mortar Primer

Quote:
Originally Posted by david s View Post
I use fine silica sand
Isnt all sand silica?
Even the clay in the sand is silica?
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  #70  
Old 05-08-2011, 03:14 AM
Serf
 
Join Date: Oct 2009
Location: Australia
Posts: 10
Default Re: High Heat Mortar Primer

Thanks David, I will check it out
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