I think fire-brick is called "fire-brick" for a good reason. They are made with special fire clay. Considering how hot an arch can get, I wouldn't want to try anything else. Some oil-fired rigs get by with refractory-blankets, but they don't run near as hot and are better controlled. Also usually used with sap run through an osmosis rig first to get half the water out and yield a shorter boil time. I suppose you're using wood?
I know my arch gets so hot it will bend lengths of rail-road track. I know because I've used them many times for temporary supports until they got hot, bent, and dropped. I've also seen standard 8" x 16" concrete blocks blow to pieces in a hot fire. Can't see how "patio" blocks would be any better.
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