What Happened Here?

scottwash;291323 said:

The concrete was already drying when poured so It dry to quick leaving air pockets, once the cream of the concrete came off top.

It expose all the holes. Now its a hazard and needs to be taken out or taken down to min of 3inches. Pressure washing will only make it worse, and exposing more holes of air pockets. I have seen a whole sidewalks like this, they should have tested it prior to pouring
concrete slump test This test is performed to check the consistency of freshly made concrete

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