While I don't know much about the application the concrete block are being used for, construction term for them is Concrete Masonry Units (C.M.U.)
As has been stated, with CMU's orientated so they are on their sides, the cells parallel to the ground, they are certainly not as strong or intended to have a load placed on them in that position, so beware of that when using these for the intended purpose, sure I realize people use these quite often for unorthodox purposes, and its generally not recommended to ever use them that way with any significant load placed on them.
The second thing that comes to mind is if they have been used before, are they in any way compromised, its not hard to fracture these, given some masons will use a masonry hammer to make ends or short pieces, while some use a wet saw for all cuts.
The only other thing I can add to this is that CMU are available in many forms and there are high strength CMU, 5000 PSI, with 75% filled cells, (supplier should have copies of their certifications on hand, as they are required for submission by contractors for approval) those would be a much better choice, and I am not recommending them to be use on their sides, but if I had no other choice, unique situation, needing support and air flow, be interesting to see some photos of an air floor on one of these to get a better idea of what you are dealing with.
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