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gravel under slab on grade

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Never roll granular material!  Rolling will not compact it, merely move it
around.

Try this experiment with a salt shaker:  Fill the salt shaker to the top
with salt.  Take a small round dowel and try to compact the salt by pushing
down on it.  Now tap the side of the salt shaker with your finger and watch
the salt compact!

Compaction of granular material can only be accomplished by using a
vibratory plate compactor.  You can walk around on properly compacted sand
without leaving a footprint.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona