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Abstract
Use of reclaimed asphalt pavement (RAP) has increased considerably over the past few years; approximately 85% of the RAP available is used within either hot mix asphalt (HMA) or warm mix asphalt (WMA). Within this time frame a number of research efforts have been performed, but most efforts have focused on RAP contents of 50% or less. This paper describes a laboratory effort that studied WMA with RAP contents of 50–100% in the areas of rutting, moisture damage, durability, cracking, and mixing uniformity. Lack of a RAP surplus coupled with performance data presented in this paper indicates that mixtures with more than 50% RAP do not, for most applications, add value to the highway system in present day. WMA with 50% RAP for use as an underlying (or base) pavement layer performed adequately in all performance areas investigated, durability and cracking included.
Acknowledgements
The authors are thankful to the Mississippi DOT Research Division, Ergon Asphalt and Emulsions, Inc. and Asphalt Technology Consulting. Dr Thomas D. White is thanked for his assistance in a variety of manners including in securing the original PURWheel equipment, and for technical guidance related to wheel tracking and moisture damage. The permission to publish was granted by the Director, Geotechnical and Structures Laboratory, US Army Engineer Research and Development Center.