Abstract
The use of “Reclaimed Asphalt Pavement” waste (RAP) has begun to be needful in different industries. These industries works needs more development and new infrastructure construction. The roads, highways, airports, etc. are among these infrastructures. As a result, huge quantities of RAP waste are generated and require special processes including reuse and recycle. Such processes for RAP reduce the quantities of this waste and, also, reduce the consumption of the energy. Recycling RAP material has been utilized in a way that covers large civil engineering applications, e.g., roadbed layers, road surfacing, bituminous mixtures, road shoulders as embankment, back-filling material, retaining walls, slope protection, landfill capping systems, pothole filler material, and drainage works. In this paper, the definition of RAP, properties affecting the efficiency of the RAP, and factors controlling the recycling of RAP has been presented. Typical ranges and average properties of RAP has been summarized and presented. The applications of RAP in the construction of roadbed layers and the design of bituminous mixtures have been discussed with typical RAP contents. It appears that the basic properties of RAP are varied widely from country to others. RAP waste is accepted by civil engineers to improve roadbed layers and asphalt mixture design.
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