Scarifiers, also called surface planers or milling machines, remove concrete faster and more aggressively than grinders. That's because they use the pummelling action of multi-tipped cutting wheels, or flails, that rotate at high speeds to chip away at the concrete surface.
A concrete planer is sometimes called a surface planer, milling machine or scarifier. Planers use multi-tipped cutter assemblies that rotate really fast, creating a pummelling action that chips away at a concrete surface and removes old coatings.
In modern construction, scabbling is a mechanical process of removing a thin layer of concrete from a structure, typically achieved by compressed air powered machines. A typical scabbling machine uses several heads, each with several carbide or steel tips that peck at the concrete.