On 23 Sep, 15:26, Lee Nowell wrote:
Hi All,

I am looking at cast the "trough" of my outdoor BBQ out of
"concrete" (i.e. the bit where you light the charcoal). *Can I used
normal concrete with some reinforcing bars? *I have assumed not but
wondered if anyone had tried it?

I was pointed in the direction of "castable 1400" which is fine to
1400 deg c but this is very expensive (£25/ bag). *I was also
wondering whether I switch regular cement with fondu cement and mix
the concrete as usual would work? *Also, is it OK to use reinforcing
mesh/ bars? *I was wondering whether they would expand within the
concrete as they got hot and crack the whole thing?

Any help appreciated.

thanks

Lee.

No. You need refractory concrete. However it doesn't weather well.
You're best with firebricks that you can replace as neccesary.