Recycled Asphalt Pavement
From RitchieWiki
Recycled Asphalt Pavement (RAP) is removed and/or reprocessed pavement materials containing a mixture or asphalt and aggregates. It is generated when pavement is removed for reconstruction or resurfacing. If properly crushed and screened, RAP consists of high-quality, well-graded aggregate coated in cement.[1]
Asphalt pavement is generally torn up by one of two methods: milling or full depth reclamation. Milling, also known as “planing,” is the removal of the surface level of the pavement. A milling or planing machine can remove up to two inches (50 mm) in a single pass.[2] Full depth reclamation involves the ripping and breaking of the entire pavement. This is usually achieved by using a rhino horn attached to a crawler tractor, or with a pneumatic pavement breaker.
This removed material can either be transported to a central mix facility for reprocessing or re-mixed and repaved immediately. Immediate reprocessing is called in-place recycling. Some milling or planing machines are equipped to strip old asphalt pavement, mix it new aggregate and binder, and then replace and compact it in a single pass.
