Scabbling—also calledscappling—is the process of reducing stone or concrete. In masonry, it refers to shaping a stone to a rough square by use of anaxe orhammer.[1] In Kent,rag-stone masons call this "knobbling".[1] It was similarly used to shapegrindstones.
In modern construction, scabbling is a mechanical process of removing a thin layer of concrete from a structure, typically achieved bycompressed air powered machines. A typical scabbling machine uses several heads, each with severalcarbide or steel tips that peck at the concrete. It operates by pounding a number of tipped rods down onto the concrete surface in rapid succession. It takes several passes with the machine to achieve the desired depth.
Scabbling is used to remove road markings, surfacecontamination (used in thenuclear industry), to add a decorative or textured pattern to concrete, or to prepare a concrete surface prior to the installation ofgrout.[2]
Scarifying machines with flails attached to a drum cage are sometimes referred to as rotary scabblers. These walk behind machines are also referred to as concrete planers.
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