Study of the Influence of the Mastic Coating of Untreated Reclaimed Asphalt Pavement on the Permanent and Resilient Behavior

Reclaimed asphalt pavement (RAP) arises from the demolition of road layers. The Optimal Recycling Asphalt Pavements Project concerns cold recycling 100 % RAP without binder addition in base and subbase layers low-traffic roads. In this context, a test program was performed with Rhine region materials to evaluate impact mastic coating untreated RAP. A source reclaimed asphalts 4.4 bitumen is tested before after extraction (RAP-BE) then compared an unbound granular material (UGM) similar particle-size distribution. Repeated load triaxial tests were conducted at several frequencies study permanent resilient behaviors. results show that UGM present behaviors, while aggregates reveal low strains. Concerning phase, RAP-BE levels strains, but moduli are significantly lower than those From experimental results, nonlinear elastic Boyce model fitted brings out highly anisotropic mechanical behavior Finally, shows frequency-sensitive viscous because mastic, effect frequency negligible for RAP-BE.