#21  
Old 10-19-2010, 02:04 PM
Apprentice
 
Join Date: Jul 2010
Location: Jacksonville,Fl
Posts: 160
Default Re: Help with homebrew mortar

Could you guys tell me the effect of getting the homebrew recipe wrong. I did the same recipe, except 2 parts sand not 3 parts. Serious trouble? I thought the most important part was the lime, as the portland gets burned out, leaving the lime as a backbone?

Thanks

Tom
Reply With Quote
  #22  
Old 10-19-2010, 02:21 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 2,988
Default Re: Help with homebrew mortar

The actual formula reads like this:

2-1/ to 3 parts aggregate by volume of all cementious ingredients.

I doubt most are doing this, since this includes the lime as a cementious ingredient, as well as the fire clay. So unless you did that you are actually probably closer to a 1 to 1 ratio. Still nothing to worry about, but it will tend to crack a little more than a weaker mix would.
Reply With Quote
  #23  
Old 10-19-2010, 02:25 PM
Apprentice
 
Join Date: Jul 2010
Location: Jacksonville,Fl
Posts: 160
Default Re: Help with homebrew mortar

Thank you Tscar. Why does more sand in the mix(weaker?) mean less likely to crack? I like the hardness that this mix gave me, at least as far as the cladding for my "shell". Nice and hard to the touch. I would have thought that stronger was better, but I'm a total newbie. Thanks
Reply With Quote
  #24  
Old 10-19-2010, 02:37 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 2,988
Default Re: Help with homebrew mortar

Mortar is not concrete. The important properties of mortar are bond strength and flexural strength. The rule of thumb for mortar is to always use the weakest mortar that will still perform adequately.

High lime mortars are high in bond and flex, high portland mortars are low in flex, high in drying shrinkage.
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
What is the best oven mortar mixture for the bricks in the dome? shingletown paul Newbie Forum 0 11-30-2009 02:17 PM
How thick a mortar gap with "horizontal" soldiers? kebwi Tools, Tips and Techniques 6 11-05-2009 08:02 AM
Maximum mortar joint on inner oven surface? kebwi Pompeii Oven Construction 17 10-27-2009 06:11 PM
Fire Mortar vs. Refax Refractory Mortar southpaw Pompeii Oven Construction 4 04-07-2007 05:02 AM


All times are GMT -7. The time now is 04:48 AM.

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