Optimizing the Effective Use of RAP in Local Roadways
Start Date: October 24, 2016
End Date: May 24, 2019
Project Completed
Researcher: Muniz Nazzal, Ohio University
To download final report, click here.
To view Results Presentation, click here.
The practice of utilizing reclaimed asphalt pavement (RAP) in new asphalt mixtures has increased in recent years due to their economic and environmental benefits. Although the potential benefits are high, the majority of local public agencies (LPAs) in Ohio allow using only small percentages of RAP (i.e.: less than 10%) in their roadways, if any. There has been numerous studies on the use of RAP in asphalt mixtures; however, these studies focus on interstates and highways systems only. Because local roads have different traffic types, volumes and patterns requiring the use of different types of mixtures than those typically utilized for interstates and highways, the RAP may influence the performance of local roadways in a different manner. Bus routes, tighter lane width, roadway diet, underground utilities, ADA curb ramps, are some factors that are generally not considered for interstate and highway systems, but contribute to local road design and mixture utilization.
The goal of this research is to assess the feasibility of RAP in the surface course of municipal and local roadways. The objective is to develop cost effective mix design and quality control recommendations for RAP use on local roadways in Ohio that does not adversely affect the performance or durability of the asphalt mixtures.
The results of this research will provide local officials with enhanced knowledge and a field validated assessment of RAP. The findings of this research will either validate or disprove the perception that utilizing RAP in the asphalt surface course can lead to cost savings while either improving or maintaining performance. It is anticipated that the results of this research may be beneficial in terms of sustainability of local roadways as it maximizes the use of recyclable materials. This information will be of assistance to local decision makers in managing budgets and the proper utilization of RAP on their respective projects.