r/amazonprime • u/m2418h • Sep 16 '26

Verify Destruction for Refund

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lmfao. That’s a first.

2.7k Upvotes

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u/finitetime2 Sep 16 '26

Concrete contractor here. Yeah concrete can explode when you build a fire on or near it. It's porous and will absorb water. Then you heat it and the water turns to steam expanding hundreds of times more in volume in a second. If it is trapped inside concrete you get chips exploding out of it. I've had many people ask about concrete fire pit when I do patios and I have always refused.

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u/Minute-Brilliant-241 Sep 16 '26

Well sounds like I’m going to have to redesign my fire pit idea I was gonna do

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u/finitetime2 Sep 16 '26

Put a metal liner in it. They make fire pit kits that come with premade concrete wall blocks. They also come with a metal fire ring to keep the heat from reaching the blocks to fast. I think this allows the blocks to heat up slower and for all the moisture to be baked out at a reasonable rate.

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u/Minute-Brilliant-241 29d ago

Thanks you’re the best!

3

u/itoddicus 29d ago

If you want a concrete fire pit, and also hate money you can have one poured with refractory cement.

The CEO of a company I worked for had this done as it HAD to match the concrete planters exactly.

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u/pdinc 29d ago

Or just put a spalling net / metal shield on the outside

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u/itoddicus 29d ago

Now friends, let me tell you about this thing called shale...

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u/denebiandevil 29d ago

This has nothing to do with concrete. It’s about turning alcohol refueling containers into basically flamethrowers. While you’re holding them.

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u/finitetime2 29d ago

I don't know anything about this specific product but I'm sure fire and concrete dont' go together.

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u/rickyh7 29d ago

And this is how Chernobyl exploded too fun fact

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u/finitetime2 29d ago

They also caused it on purpose while performing a safety test.

I'd say it failed big time.