A concrete scarifier, otherwise known as a planer, is used for heavy-duty concrete removal. These machines have a series of wheels made of steel or tungsten. These wheels spin and pummel the ground until the concrete breaks up. They are typically used for removing trip hazards, creating grooves for slip-resistant sidewalks and leveling. United Rentals offers walk-behind scarifiers with optional vacuum attachments to help you with cleanup. Because scarifiers use wheels, they leave a rough surface texture. A concrete grinder would be able to smooth this roughness and prepare the concrete for coating. Read United Rentals’ guide to concrete scarifying here.