In recent years, many state highway agencies and the Federal Highway Administration have placed increasing emphasis on sustainability and recycling. In addition, with the current rapid escalation of the costs for building with virgin highway materials, there is a growing interest in making maximum use of existing pavement assets in rehabilitation strategies. Although there has been much research and testing efforts with warm mix asphalt (WMA) technologies and the use of hot mix asphalt (HMA) with high reclaimed asphalt pavement (RAP) content, minimal resources have been focused on exploring the advantages of cold-recycling technology, particularly cold in-place recycling (CIR) and full-depth reclamation (FDR).
There is minimal information on the material properties of CIR and FDR AC available to facilitate the structural design of pavements incorporating stabilized base materials produced with these processes. In particular, the Mechanistic-Empirical Pavement Design Guide (MEPDG) developed under NCHRP Project 1-37A and now available as the AASHTOWare Pavement ME Design program provides little if any guidance for using these processes.
The objective of this research was to propose material properties and associated test methods and distress models for predicting the performance of pavement layers prepared with CIR of AC and FDR of AC with aggregate base and minimal amounts of subgrade material using asphalt-based materials.
The project final report is available as NCHRP Report 863
, Material Properties of Cold In-Place Recycled and Full-Depth Reclamation Asphalt Concrete.