This is a warehouse, due to liquid material leaks for years, the floor is covered thicker and elastic materials like black tar. Worker attempted to use regular grinding tools to work on it, very hard to take it off.
The proper and most effective tools should be PCD diamond which is Polycrystalline Diamonds. The outstanding characteristics of PCD is it very aggressive and very durable. It can quickly remove the thick coverings so as to expose new concrete.
As you can see the video how much the scraps produced.