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Mojtaba Mohammadafzali [1] and Hesham Ali [1] and James A. Musselman [2] and Gregory A. Sholar [3] and Aidin Massahi [1]

Academic Editor: Luigi Di Sarno

1, Department of Civil and Environmental Engineering, Florida International University, Miami, FL, USA, fiu.edu

2, Oldcastle Materials Group, Lutz, FL, USA, oldcastlematerials.com

3, State Material Office, Florida Department of Transportation, Gainesville, FL, USA, fdot.gov

Received Jan 30, 2017; Accepted Jun 7, 2017

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

1. Introduction

The use of asphalt pavement recycling methods as alternatives to milling and resurfacing has increased significantly in recent years [1]. When used properly, pavement recycling can result in benefits such as cost savings, decreasing the demand for new material and minimizing emissions due to material transportation [2]. Some asphalt recycling methods, such as Hot In-place Recycling (HIR) and Cold In-place Recycling, require incorporating 100% or close to 100% Reclaimed Asphalt Pavement (RAP) material [1].

Ideally, a properly recycled pavement should have a good initial performance, compared to a new pavement, and its performance should not drop faster than that of a new pavement. In-place recycled pavements often use 100% or close to 100% RAP material. Therefore, their behavior can be different from new mixtures. Cracking resistance and durability are among important performance parameters. Rejuvenators and other additives are often used to enhance the properties of the recycled material [3, 4]. The use of rejuvenators can also prevent segregation problems that are caused by the lack of appropriate adhesion of the binder and improve the bond strength of asphalt overlays [5, 6]. Some previous studies show that the performance of recycled mixtures is equally good or better than new mixtures. A study that used the Indirect Tensile Strength test and Asphalt Pavement Analyzer showed that mixtures containing RAP successfully passed specification requirements and generally had better performance than new mixtures [7]. A more comprehensive work that included using the energy ratio concept confirmed that inclusion of RAP generally increases the tensile strength. However, it was concluded that since recycled mixtures have lower rates of dissipated creep strain energy and the energy imposed on them is more...

 

 
 

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