[madmaxx]

You are putting your life in the hands of the concrete installer, usually not rocket scientist unless they are pouring slabs for lathes and other machine shop equipment and then you are talking $$$$$$ if the even touch it. All concrete is 3000 psig it is the rebar pattern, are they using a vibrator to ensure no air pockets, what about the anchors, epoxy very strong as long as you follow the instructions EXACTLY. Most drill the hole to large or rotate the fastner when installing.

Not worth it and I am one to take risk. In reality the only purpose for concrete is to maintain the spacing on the rebar!!!