Scarifying involves scratching, etching, or some sort of superficial cutting or incision. In alternative contexts scarification may refer to the cutting of concrete using rotating carbide cutters or teeth.
Scarification of concrete can be done using hydrodemolition, or hydro scarification, and high speed scarification. The depth of removal depends on the application, but usually does not exceed 1/4" to 3/4". The use of scarification on concrete is used to provide a better bond profile with an overlay of the same material. Scarification sometimes follows an initial milling of a surface using a large mechanical grinder. The hydro scarification following this process can have the effect of eliminating micro-fractures produced by the impact of the milling machine. The absence of micro-fractures and the creation of a better bond profile, both help to create a better bond strength with the concrete overlay