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  #1  
Old 09-21-2013, 09:57 AM
Filthymutt's Avatar
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Default Crack

After the massive fire. The dome itself was fine but I got a crack in my outer arch.
Maybe 1mm between a brick on the left side of the arch and it's mortar joint on the uphill side. What I mean is, the mortar as a mass is intact but it's as if it has pulled away from the brick to leave a crack there.
Seems still structurally sound but it's not nice to see. Like a zit on an otherwise nice face.
Should I slather more mortar onto it or leave it be?
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Old 09-21-2013, 11:28 AM
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Default Re: Crack

Leave it....a mortar parge wont hold.
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Old 09-21-2013, 02:10 PM
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Default Re: Crack

I got a very small hairline crack in mine when I first fired it, while its not a problem structurally it bugged the hell out of me.

I racked out the joint to a depth of 5mm, moistened the joint and refilled it, it hasnt reappeared.
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Old 09-21-2013, 06:28 PM
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Default Re: Crack

Quote:
Originally Posted by brickie in oz View Post
I got a very small hairline crack in mine when I first fired it, while its not a problem structurally it bugged the hell out of me.

I racked out the joint to a depth of 5mm, moistened the joint and refilled it, it hasnt reappeared.
Ok thanks. It's as you said, if I just leave it be it is going to bug me forever. I think I will try your method and hope for the best. After you did that, how long did you wait, curing time, for your next firing?

Bob
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Old 09-21-2013, 06:52 PM
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Default Re: Crack

I also filled my small cracks - a few came back (but smaller than they were) and some never re-appeared. After that I stopped worrying about them and have had no issues!
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Old 09-21-2013, 07:31 PM
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Default Re: Crack

Quote:
Originally Posted by Filthymutt View Post
Ok thanks. It's as you said, if I just leave it be it is going to bug me forever. I think I will try your method and hope for the best. After you did that, how long did you wait, curing time, for your next firing?

Bob
I think I just left it till the next firing which was probably a week or so.
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Old 09-21-2013, 07:40 PM
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Default Re: Crack

Ok cool. I'll do the same. Thanks!
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Old 09-22-2013, 09:48 AM
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Default Re: Crack

As with any portland cement based mortar or concrete mix, it will cure harder if you keep it wet/damp while it is curing (try to keep it damp for at least 3-5 days).
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Old 09-22-2013, 01:27 PM
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Default Re: Crack

I would not say anything, but the last statement pushes on of my buttons. Mortar and concrete are not the same thing. They do not share the same functions, only some of the same ingredients.

Normally with concrete you want the strongest concrete that is practical. This is NOT true with mortar. When doing a mix design for a mortar, you want the WEAKEST mortar that will suffice.

Concrete: High compressive and tensile strength.

Mortar: Weaker than the units being laid, high bond strength and flexural strength.
brickie in oz and cobblerdave like this.
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Old 09-22-2013, 01:58 PM
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Default Re: Crack

Cracks in the outer decorative arch are not unusual in many builds. They are caused by a high difference in temp between the inner and outer surfaces of the arch's bricks, resulting in uneven thermal expansion. In addition actual expansion from the inner parts of the oven can also create physical outward pressure on the arch. Both conditions are reduced and cracks in the arch pretty much eliminated if the design incorporates an expansion joint/ heatbreak between the decorative arch and the inner oven parts.

Last edited by david s; 09-22-2013 at 03:53 PM. Reason: Grammar
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