Workability and Engineering Performance Characterization of Warm Asphalt Rubber Mixtures Prepared with Various WMA Additives

Warm mix asphalt (WMA) technology offers a promising solution to address the workability concern of asphalt rubber (AR) mixture. Warm asphalt rubber (WAR), the combination of AR and WMA, is a potential sustainable paving technology that integrates various benefits, such as energy conservation, waste management, noise reduction, and performance optimization. This study aims to characterize and compare the workabilities and engineering properties of the WAR mixtures prepared with various WMA additives. To achieve this goal, laboratory WAR mixture samples were prepared with 40-mesh crumb rubber and five different WMA additives, including Evotherm-DAT, Evotherm-3G, Sasobit, #56 paraffin wax and Aspha-min. Comprehensive laboratory tests were conducted to characterize their workabilities and engineering properties, including moisture susceptibility, stiffness modulus, dynamic modulus, and rutting and fatigue resistance. The test results indicated that the construction temperatures of all WAR mixtures in this study can be at least 16°C lower than that of their corresponding hot AR mixtures, achieving the similar compaction level. The stiffness modulus and dynamic modulus of the WAR mixtures varied depending on the type of the WMA additive that has been used. All WAR mixtures exhibited acceptable moisture susceptibility, rutting resistance and fatigue resistance. Among various WMA additives, Sasobit provided the most satisfying performance. Overall, the results of the mixture mechanical analyses are consistent with those of the binder rheological analysis, except for fatigue resistance.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures.
• Authors:
  • Yu, Huayang
  • Leng, Zhen
  • Zhang, Yuan
  • Tan, Zhifei
  • Guo, Feng
  • Yan, Jinhai
• Conference:
  • Transportation Research Board 97th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2018-1-7 to 2018-1-11
• Date: 2018

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 17p

Subject/Index Terms

• TRT Terms: Asphalt additives; Asphalt rubber; Crumb rubber; Paraffin; Properties of materials; Warm mix paving mixtures; Workability
• Identifier Terms: Aspha-Min; Evotherm; Sasobit
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01660206
• Record Type: Publication
• Report/Paper Numbers: 18-03339
• Files: TRIS, TRB, ATRI
• Created Date: Feb 19 2018 12:01PM