The environment is more and more a topical issue, the recycling of old pavement layers has developed a lot in recent years. In place or in power stations provided for this purpose.
Since the first discussions, recycling techniques have grown considerably in the field of road manufacturing and maintenance.
This maintenance involves milling the old layers of pavement: this leads to the production of waste, the costs of asphalt in large quantities
Their treatment is carried out according to two methods
The most used at present: The valuation is done by the reuse of raw aggregates or after crushing (RAP), most for backfilling.
Evolving in our time: the use of RAP in an industrial process leading to the development of a new product. This still represents only a very small part of waste treatment. This recycling makes it possible to reduce the quantities of new materials to bring.
Hot process, with the production of a traditional mix usually incorporating 10 to 15% aggregates (and up to 40-50% in some cases),
Cold where milled material (also called Reclaimed Asphalt Pavement "RAP") are treated with a hydrocarbon binder (emulsion or bitumen foam) or, more rarely, with a hydraulic binder (cement or road binder).
On-site recycling is also a solution compared to plant recycling.