Evaluation of moderate and high RAP mixtures at laboratory and pavement scales

The use of reclaimed asphalt pavement (RAP) to replace the virgin materials in asphalt mixtures can result in significant cost savings and provide environmental benefits. As part of the national efforts to support the increasing use of RAP without adversely affecting the long-term performance of asphalt mixtures, a field evaluation of six asphalt mixtures containing moderate and high RAP contents has been conducted on six test sections at the National Center for Asphalt Technology Pavement Test Track since the third research cycle started in 2006. The objective of this study was to present the latest field and laboratory evaluation results of these six RAP mixtures. The field performance evaluated included rutting, roughness, surface texture and cracking. Sections W4 and W3 were constructed with 20% RAP mixes using PG 67-22 and PG 76-22 base binders, respectively. The four other sections, W5, E5, E6 and E7, were paved with 45% RAP mixtures using four different base binder options, consisting of PG 52-28, ...