Just encountered floor system of telephone swithcing facility utilizing 4" thick 24" wide x 12" long CMU blocks which have 3 ribs containing a minimum of (1) #4 continuous in groutd holes in each rib. Couldn't tell if any prestressing present. CMU has 2" concrete topping over it. Floor spans are 8"-8" clear between 12" cmu bearing walls. See attached.
Can anyone help identify this system?
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