When is scarification needed for road work?
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I assume you are talking about flexible (asphalt) pavements. Sacrification is needed when the cuts, potholes and all deformations are such that :
The entire bituminous layer until the depth of the craters is scraped off, and a new layer with fresh material is then applied to reconstruct the road.
Madeh Izat Hamakareem
Scarification is carried to remove unacceptable asphalt that does not meet standard specifications, remove irregularities, bumps, or ruts on the road before resurfacing it.