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Old 04-26-2011, 09:01 PM
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Question Limestone as an alternative firebrick

Hi All

Firebricks are expensive here in Oz. My father in-law has these limestone slabs (approximately 600mmx300mmx75mm). I was wondering if limestone is a suitable alternative? I know that they use lime mortar in colder countries but that where my knowledge ends. I was thinking I could cut it down into appropriate size for the Pompeii oven. Its free which will save me considerable money. Putting the question out there. Can I use limestone as opposed to regular firebricks??

Thanks

Bert
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Old 04-26-2011, 11:44 PM
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Default Re: Limestone as an alternative firebrick

They burn limestone to make quick lime to make the hydrated lime you buy in a bag, so no you cant use it.
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Old 04-27-2011, 03:34 PM
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Default Re: Limestone as an alternative firebrick

Bugger! Not the answer I was after Brickie from Oz, but thanks.
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Old 04-27-2011, 05:20 PM
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Default Re: Limestone as an alternative firebrick

Bert,

Limestone blocks would make a great base material. You can do your enclosure and other construction features with it. Maybe even tint the mortar for color contrast, etc.

Cheers,
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Old 04-27-2011, 05:54 PM
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Default Re: Limestone as an alternative firebrick

Here is a video that will show you what would happen to the heated limestone if it was ever exposed to water. Interesting science project and bad wood fired oven material choice.
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Old 04-27-2011, 06:54 PM
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Default Re: Limestone as an alternative firebrick

Yep, portland concrete is basically artificial limestone. I think you'd find the naturally occurring limestone would spall, crack, and crumble just as badly.
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Old 04-27-2011, 09:45 PM
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Default Re: Limestone as an alternative firebrick

Quote:
Originally Posted by tusr18a View Post
Here is a video that will show you what would happen to the heated limestone if it was ever exposed to water. Interesting science project and bad wood fired oven material choice.
What an excellent video..
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