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Old 10-10-2008, 01:13 PM   #1
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Pouring concrete in fire pit


I have a tractor tire rim that i buried to use as a fire pit. I like to scrap up the ashes and use them in my garden. I was thinking that it would be easier to clean out if I had a solid bottom in it. However, I was told that regular concrete would explode due to trapped moisture. What is the best way to do this? Pour the concrete and in-bed some fire bricks into it? Thanks!

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Old 10-10-2008, 03:03 PM   #2
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Pouring concrete in fire pit


Firebrick with refractory mortar would be the best way to go. Refractory mortar is high-heat resistant, and is for use in fireplaces.

I don't think concrete would explode. It would certainly deteriorate after repeated fires though.

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Old 10-10-2008, 04:10 PM   #3
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Pouring concrete in fire pit


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Originally Posted by thekctermite View Post
Firebrick with refractory mortar would be the best way to go. Refractory mortar is high-heat resistant, and is for use in fireplaces.

I don't think concrete would explode. It would certainly deteriorate after repeated fires though.
It will explode, trust me on this one. Not so much because of moisture but because of air bubbles.

I have treated people who had chunks of it fly off and cut them. Nothing serious and the people who called 911 just panicked because of the blood.

I have also seen bridges made of concrete explode and big chunks fly off because a semi hauliing gas, tipped and caught fire.

Granted this was a really hot fire but having hot coals will do the same as the concrete heats up.

I have also seen rocks explode in a fire ring. Most of the time they just crack and make a pop when they do but every now and then one will send some shrapnel flying.

Firebricks would be your best bet as thekctermite said.
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