Data center raised flooring is very often concrete filled metal panels sitting in a gridwork of steel framing on pedestals adhered to the slab at precise locations...special vacuum/suction cup lifters are usually required to set and/or lift and the panels are HEAVY (with plenty of punctuation)
A link to typical installation follows:
https://www.accessfloorsystems.com/i...llation-guide/

On Friday, February 19, 2016 at 1:33:30 PM UTC-5, Electric Comet wrote:
On Thu, 18 Feb 2016 16:41:59 -0600
swalker wrote:

I will use 2 X 4 sleepers on the concrete with plywood over the
sleepers.

fyi raised floors in data centers are fast becoming obsolete so maybe
you can find a data center that is converting back to slab and fan walls

is your equipment stationary

if it is then you could have grates and dust collectors in the floor

you might be the envy of the woodworking community