Go Back   Forno Bravo Forum: The Wood-Fired Oven Community > Good Background Information > Newbie Forum

Like Tree1Likes

Reply
 
LinkBack Thread Tools Display Modes
  #11  
Old 01-24-2013, 06:45 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,086
Default Re: Clay Mortar

In the lime plaster that I refer to, you should not use ANY portland. Some of the latest research shows that my old rules were wrong. My rule of thumb used to be you could gauge with up to 10% cementious (which would include brick dust or portland) material, but it appears that anything more than 2% is deleterious to the plaster. Mortar is a bit different than plaster/stucco though.

Edit-Googlize "Smeaton Project" for the study. Page 12 of 18 for conclusions.

Last edited by Tscarborough; 01-24-2013 at 07:30 PM.
Reply With Quote
  #12  
Old 01-25-2013, 08:20 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,086
Default Re: Clay Mortar

Yes, it is important to note that when talking about brick dust in this context, that it is not FIREBRICK dust, just normal silicious clay brick.
Reply With Quote
  #13  
Old 01-25-2013, 12:38 PM
dimitrisbizakis's Avatar
Apprentice
 
Join Date: Dec 2012
Location: Greece
Posts: 132
Default Re: Clay Mortar

Quote:
Originally Posted by Tscarborough View Post
Yes, it is important to note that when talking about brick dust in this context, that it is not FIREBRICK dust, just normal silicious clay brick.
Are you talking about plastering only or it can be used as mortar for the Dome?
Why not Firebrick Dust?
Firebrick dust here in Greece is called samot or (at free translation) firedirt and is VERY expensive and i don't know the reason...25 kg costs 20 Euro!!!

Last edited by dimitrisbizakis; 01-25-2013 at 01:15 PM.
Reply With Quote
  #14  
Old 01-25-2013, 01:48 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,086
Default Re: Clay Mortar

Because the silica is the hydraulic agent and high alumina firebrick have proportionately less silica. Fire clay is not the same thing as brick dust (and 20 Euros for 25 Kg is cheap).
Reply With Quote
  #15  
Old 01-25-2013, 01:56 PM
dimitrisbizakis's Avatar
Apprentice
 
Join Date: Dec 2012
Location: Greece
Posts: 132
Default Re: Clay Mortar

Quote:
Originally Posted by Tscarborough View Post
Because the silica is the hydraulic agent and high alumina firebrick have proportionately less silica. Fire clay is not the same thing as brick dust (and 20 Euros for 25 Kg is cheap).
Fire clay is clay higher in Alumina, i guess.
20 Euros is a day's work here...anyway!
Reply With Quote
  #16  
Old 01-25-2013, 02:35 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,086
Default Re: Clay Mortar

Yes, it is higher in alumina, but it is not fired. You do not need it anyway, at least not that much of it.
Reply With Quote
  #17  
Old 01-25-2013, 02:55 PM
dimitrisbizakis's Avatar
Apprentice
 
Join Date: Dec 2012
Location: Greece
Posts: 132
Default Re: Clay Mortar

Quote:
Originally Posted by wotavidone View Post
20 Euros is a day's work? Geez things are bad in Greece. I feel for you. We will probably spend more than that buying the meat for our Australia Day BBQ today. Take heart and don't give up, mate. The news and opinions websites say the corner has been turned, and Greece will survive.

ONe point I'd like to make about brick dust and its hydraulic properties. I suggest the mud from a wet saw will probably have already hydrated and won't have much in the way of cementitious properties when you go to use it in a mortar.
(offtopic on)
...it's a day's work IF you have a work....yeah, it's ungly here and the bad thing is that people are loosing their hope, only this year there where 2000 suicides!
Greece will survive(as a Country), for the people i don't know, somehow politics don't care for the people, like the think that a Country is just the building's.
The main reason i build the oven is for to bake the week's bread with few firewood for saving some money for the kids.
Anyway, i hope things will get better.
(offtopic off)
As for the mix i thing i will go with just lime, Cement, sand and the clay i have found from the closed clay brick factory.
I'll make some test's with 2 bricks joined and placing them in my firestove to see the results before i make the final dome.
My love to Australia, lot's of our people have been helped there.
Reply With Quote
  #18  
Old 01-25-2013, 03:23 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,086
Default Re: Clay Mortar

You don't really need to test it it, will work fine. Remember that mortar is not used to hold bricks together, it is used to hold them apart.
Reply With Quote
  #19  
Old 01-26-2013, 01:26 AM
dimitrisbizakis's Avatar
Apprentice
 
Join Date: Dec 2012
Location: Greece
Posts: 132
Default Re: Clay Mortar

Quote:
Originally Posted by Tscarborough View Post
You don't really need to test it it, will work fine. Remember that mortar is not used to hold bricks together, it is used to hold them apart.
It's realy nice to hear THAT point of view!
Does make any difference that i don't tamper cut the bricks, even on the top of the dome?
Reply With Quote
  #20  
Old 01-26-2013, 04:50 AM
cobblerdave's Avatar
Il Pizzaiolo
 
Join Date: Jan 2010
Location: brisbane australia
Posts: 2,388
Default Re: Clay Mortar

Gudday
That's right you don't need perfectly tapered bricks to achieve a perfectly strong and working dome. Just looks better that's all. You'll find that the top of the oven will require 1/4 bricks instead of 1/2s due to the tighter curve
Regards dave
__________________
Measure twice
Cut once
Fit in position with largest hammer

My Build

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

My Door

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
High Heat Mortar Primer james Getting Started 80 01-27-2014 06:40 PM
Who has used the calcium aluminate option for mortar? Lburou Pompeii Oven Construction 23 08-20-2011 08:00 PM
Heat-dry mortar made of refactory clay and refactory sand (and nothing else) Frances Pompeii Oven Construction 11 06-25-2011 03:09 PM
Fire clay Mortar Vs Refractor Mortar FB.... HeatStop... Earthcore 100million Finding Building Materials 32 05-20-2010 07:44 PM
How thick a mortar gap with "horizontal" soldiers? kebwi Tools, Tips and Techniques 6 11-05-2009 08:02 AM


All times are GMT -7. The time now is 03:21 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC