Autores: Pablo Orosa, Ignacio Pérez, Ana María Rodríguez
Asphalt recycling has increased significantly in recent years and has become one of the 2 preferred methods for rehabilitating existing pavements. One of the most commonly used 3 pavement rehabilitation techniques is cold in-place recycling (CIR) with bitumen 4 emulsion. This technique consists of milling existing degraded pavement layers and 5 using the resulting material as the main aggregate in a new asphalt mixture. During CIR 6 milling operations, only layers of existing bituminous materials are recycled, reaching 7 depths of 6–12 cm . This recycled bituminous material is known as reclaimed asphalt 8 pavement (RAP) and is usually mixed with bitumen emulsion or foamed bitumen, which 9 acts as the main binder. It is also common for Portland cement or other mineral 10 additives to be used to improve the mechanical properties of this type of mixture. 11 Additionally, RAP is frequently used to build base courses and is employed in most low-12 to-medium-traffic-volume roadways.
