Heat and fire resistant concrete

m4r10

Hi guys. I'm thinking of trying my hand at building a concrete fire pit and was wondering if there's such a thing as a heat and fire resistant concrete to use or any concrete should suffice.

Had a look into B&Q the other day but there was no special mention of heat and fire resistant on any of the concrete bags. Also for convenience I'd like to use the rapid setting concrete, would that be OK?

Thanks in advance.

Gumbo

Concrete by its very nature is non combustible.
But it will suffer from spalling after been exposed to high heat for a given time.

May depend on the thickness of the concrete etc but most fire pits seem to last some time as the heat generated is relatively low compared to an all out raging fire.

CJhaughey

Any fire lit directly on concrete that I have seen will result in significant deterioration of the concrete. The last one I saw resulted in a small explosion and a large patch of concrete blown out!
I assume this was from entrapped air/water building pressure.
OP I would look at making a pit from Firebricks you can buy them in large sizes and cut to fit.

m4r10

Thanks for the suggestions. I've read about concrete blowing up from intense heat, hence my question. Unfortunately I can't use the bricks as I'll need to pour the concrete in a specific shape.

If I can't find any heat and fire resistant concrete, I'll use the regular one as the pit won't be subjected to intense heat.