Inspect the tin plating on the concrete slab to determine how the tin plating is attached. Likely, you will see concrete nails in the surface of the tin plating.
Put on work gloves and goggles then insert a crow bar between the tin plating and the concrete. If you see a concrete nail on the sides of the slab, position the crowbar under the nail head.
Hit the flat top of the crowbar several times with the hammer. Continue to pry up around all sides of the tin plating. You should begin to loosen the plating from the surface of the concrete. If you see nails and they cannot be dislodged easily with the crowbar and hammer, then pull them out with a pair of pliers. Once the sides are sufficiently loosened, you can lift up the plating from the slab and remove it.