A Comprehensive Review on the Replacement of Virgin Material using Reclaimed Asphalt Pavement (RAP) Material in Flexible Pavements

Abstract

With increased demand and limited aggregate and binder supply brings the use of Reclaimed Asphalt Pavement (RAP) as a valuable component in Hot Mix Asphalt(HMA) since 1970’s in US. Later on, the use of RAP has evolved into a regular practice in many countries around the world and use of these materials in the past has proven to be economically and environmentally sound. Mixing of RAP in virgin materials has been greatly favored over virgin materials because of increase in cost of asphalt, scarcity of quality aggregates and asphalt. The use of RAP in pavement design is Recycling the left over Asphalt through crushing and is recycled back into asphalt which performs equal or better than the virgin mixtures. Now-a-days being more environmentally friendly is important and hence, recycling on site can offer real benefits not only through better planning and regulations, but also saving in the waste disposal charges, energy saving which is modified into the strengthen material. The use of RAP is gaining momentum in India at present and there were very limited studies carried out on the use of RAP in Warm Mix Asphalt (WMA) as well. Therefore an ample scope exists inorder to investigate the complete usage of RAP content.