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Old 08-11-2019, 02:43 PM   #1
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concrete blocks


Will concrete blocks fall apart if exposed to fire repeatedly?
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Old 08-11-2019, 03:21 PM   #2
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Re: concrete blocks


Here is more than I care to read but maybe it will get you a start....https://www.emcoblock.com/pdf/divisi...ce-ratings.pdf
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Old 08-11-2019, 04:02 PM   #3
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Re: concrete blocks


Thanks. Trying to save a little money. Building a fire pit to fire pottery. I have a bunch of blocks left over from a project at another house. The pottery will be fired in a barrel. But It will need blocks around and under the barrel.
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Old 08-11-2019, 06:05 PM   #4
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Re: concrete blocks


One thing to consider: If the blocks are outside and permitted to get wet and then you fire the pit, the water in the block boils and it cracks the block.

We had a fire pit that used red sandstone caps. After a rain we made a fire in the fire pit. Pieces of the sandstone were exploding and raining down on us shortly thereafter.
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Old 08-12-2019, 05:01 AM   #5
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Re: concrete blocks


Concrete blocks deteriorate when exposed to fire, you need to either use fire brick or natural stone. But if I understand you correctly - the block won't be exposed to fire, just heat?
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Old 08-12-2019, 05:15 AM   #6
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Re: concrete blocks


Plain average concrete block will fall apart after repeated use in this way.

I have seen solid Granite, start to come apart, after repeated use as a fire pit also, So use some kind of protection, like a fire ring, or other way to isolate your block from most of the intense heat generated in a homemade kiln, for pottery.

Or use real Firebrick as a liner.


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Old 08-13-2019, 04:22 PM   #7
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Re: concrete blocks


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Originally Posted by mark sr View Post
Concrete blocks deteriorate when exposed to fire, you need to either use fire brick or natural stone. But if I understand you correctly - the block won't be exposed to fire, just heat?
Just heat. The barrel will get the direct fire.
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Old 08-13-2019, 10:31 PM   #8
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Re: concrete blocks


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Just heat. The barrel will get the direct fire.
Is this barrel, a typical 55 gallon oil drum?

If so they last for a while, but eventually rot out from the heat and rust.

Remember when it was legal to burn your household garbage in one?

How long did it last, until a person needed to replace it?

5 years maybe, depending on how often you burned the trash.


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Old 08-14-2019, 04:17 AM   #9
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Re: concrete blocks


I still burn my trash in a 55 gallon drum a few times a week. Before I started putting a lid on it to keep the rain water out they only lasted a yr or two. Now I get 5 plus years out of a burn barrel. Not all 55 gallon drums are equal, some are stouter than others.
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Old 08-14-2019, 07:47 AM   #10
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Re: concrete blocks


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Originally Posted by de-nagorg View Post
Is this barrel, a typical 55 gallon oil drum?

If so they last for a while, but eventually rot out from the heat and rust.

Remember when it was legal to burn your household garbage in one?

How long did it last, until a person needed to replace it?

5 years maybe, depending on how often you burned the trash.


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The local college has pit fired in the same barrel for years. Pit firing gives a different look than kiln fire.
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Old Today, 04:47 PM   #11
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Re: concrete blocks


even a granite faced fireplace is lined w/firebrick & mortar,,, exploding rock's like a grenade to anyone in the effective kill zone
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Old Today, 09:27 PM   #12
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Re: concrete blocks


Have you thought about.?

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