Long-Term Performance of a Hot In-Place Recycling Project -- Final Report

This report documents the construction and long-term performance of a hot in-place recycled (HIPR) project on SR 542. HIPR project selection, mix design, construction and testing are described. It was shown that the HIPR process successfully rehabilitated the pavement using less new material than a traditional HMA mill and fill while reducing project costs and traffic disruptions as compared to conventional HMA construction. The roadway met the design criteria according to the Asphalt Recycling and Reclaiming Association.

Performance of the HIPR was monitored for 6 years using periodic photos of the pavement and data from the Washington State Pavement Management System (WSPMS). The HIPR pavement after construction was observed to have an open texture and dry appearance, possibly due to inadequate asphalt binder content. The pavement is currently characterized by a raveled surface with alligator and longitudinal cracking at various locations.

The poor performance has been attributed to insufficient asphalt binder in the HIPR mix. The HIPR process may have been a contributing factor due to aging of the binder in the existing pavement, but was not the primary cause of the pavement’s poor performance. Due to the poor condition of the pavement a chip seal is programmed for 2018. A life cycle cost analysis showed the HIPR to have an annual per lane mile cost $3,700 more than a conventional 0.15’ mill and fill HMA pavement.
Publication Date: 
Tuesday, August 23, 2016
Publication Number: 
WA-RD 738.2
Last modified: 
10/12/2016 - 15:42
Authors: 
Keith W. Anderson, Mark Russell, Jeff S. Uhlmeyer, Joe DeVol, Chris Johnson, Jim Weston.
Originator: 
Washington (State). Department of Transportation. Materials Laboratory.
Number of Pages: 
99
Subject: 
Hot in-place recycling, Pavement performance, Materials tests, Pavement maintenance, Rehabilitation (Maintenance), In-place recycling, Asphalt pavements, Evaluation and assessment.