#11  
Old 04-16-2011, 03:21 PM
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Default Re: Curing

yes, and this is the reason why many brick kilns have no mortar between the bricks. Same goes for our oven brick floors.
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  #12  
Old 04-16-2011, 03:43 PM
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Default Re: Curing

DavidS,

So is it the potential for oven movement that it is advised to minimize or eliminate inside mortar joints? I thought it was because portland cement begins to break down at 500F. There is a high percentage of builds on the FB site that have little or no exposed joints in the oven interior with 1"+ gaps on the dome exterior.

John
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Old 04-16-2011, 04:05 PM
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Yeah,
Because the oven is moving stresses build up and something is probably going to give. Like Brickie said you'd prefer that your mortar failed before the bricks. So the mortar should be weaker than the bricks it joins. However you don't want it too weak.
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Old 04-16-2011, 04:13 PM
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Its far easier to repoint a few joints rather than replacing a brick.
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Old 04-18-2011, 09:11 AM
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Default Re: Curing

How does the homebrew recipe of 1-3-1-1 (portland, sand, lime, fireclay) work out strength-wise?
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Old 04-18-2011, 06:07 PM
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Default Re: Curing

Portland based concretes must be cured with continuous moisture to reach useful strength. Typically 7 days minimum.
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Old 04-18-2011, 06:57 PM
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Default Re: Curing

Although I haven't done homebrew, I'll reiterate my support for heatstop 50. excellent product, no cracks. I slow cured with wet towels and blankets for a week or so, then air cured for 10 days before starting the fires.

I'm running real hot, and no issues whatsoever inside. I was a little surprised, because I expected internal cracks after reading the forum and given that I'm a rank amateur. but nothing.

If it's available in your area, (mine was $50 per bag), I'd use it.

Paul
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Old 04-18-2011, 11:37 PM
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Quote:
Originally Posted by Neil2 View Post
Portland based concretes must be cured with continuous moisture to reach useful strength. Typically 7 days minimum.
Your graph just shows it gets stronger over time, which it does.
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Old 04-18-2011, 11:54 PM
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Yes, but only if you keep it wet. Read the info again.
http://www.concrete.net.au/publicati...f/Curing06.pdf
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Old 04-19-2011, 12:08 AM
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Default Re: Curing

After 7 days with no "curing" you cant drive a concrete nail into my mortar, so what am I missing?
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