If you have an existing concrete slab you can certainly remove the existing floor tiles and then Mechanically Polish the concrete slab.
Please refer to the Warehouse Finish section on our website.
It's not usually possible to pour a new concrete slab over existing flooring or if you are on stumps as the concrete slab to be polished should typically be a minimum of 100mm thick.
If you have any further queries please do not hesitate to contact us.