Your comments please…
WTF???
I bet part of Hoffa is in here!!!
It looks like it was filled with concrete, in which case it seems fine other than the untreated shim on top.
I echo Brian!
What a great idea, A green home recycle recycle .
Why was this extra support needed? What was on the floor above it?
I would also expect to see metal terminate shields at the top of each pier.