In-Place Recycling and Reclamation of Asphaltic Concrete Pavements in Kentucky
Full-depth reclamation has been defined by the Asphalt Recycling and Reclaiming Association as a "rehabilitation technique in which the full thickness of the asphalt pavement and a predetermined portion of the underlying material (base, subbase, and/or subgrade) is uniformly pulverized, blended and compacted to provide an upgraded, homogeneous material resulting in a stabilized base course." The Kentucky Transportation Cabinet has utilized the full-depth reclamation (FDR) process as a method to
... cess as a method to address asphalt pavements exhibiting widespread base failures. The FDR process transforms the existing hot mix asphalt (HMA) pavement and underlying granular materials into a stabilized base layer. The stabilized layer is then overlaid with a new HMA surface layer. However, the process of when and how to use the FDR process has not been well defined in Kentucky. The Cabinet commonly uses its Special Note for Cement Stabilized Roadbed as guidance for a stabilized subgrade and is dependent upon the road contractor for a suitable mixture design. The research reported herein presents suggested guidelines to the Kentucky Transportation Cabinet for the design and construction for FDR pavements. Special Notes for Full-Depth Reclamation of Hot Mix Asphalt pavements using cement and asphalt emulsions as stabilizers are presented for consideration. This report, along with the Special Notes, includes a process to identify potential projects for the FDR process, criteria for selecting the stabilizer best suited to the conditions, the optimum thickness of material to be recycled, and the amount of stabilizer to be added.