Linear Viscoelastic Behavior of Cold Recycled Asphalt Materials with Various Percentages of Recycled Asphalt

Full Depth Reclamation (FDR) and Cold In-Place Recycling (CIR) are rehabilitation techniques in which the existing pavement materials are reused in place without application of heat during the recycling process. These are environmentally friendly methods. However, even if many successful projects were completed with these techniques, some problems are still not addressed by the researchers on the subject. One of the areas where much work is needed is in the linear viscoelastic (LVE) behaviour of those materials. This study was undertaken to evaluate the rheological behavior of the cold recycled emulsified asphalt materials (CRM) with four different combinations of reclaimed asphalt pavement (RAP) (50%, 75%, 85%, and 100%). The scope of work for this study consisted of preparing the laboratory compacted CRM specimens, determining the complex modulus (E*) of compacted specimens at various testing temperatures and loading frequencies, analyzing the experimental data with the help of 2S2P1D (2S: two springs, 2P: two parabolic elements, 1D: one dashpot) model and finally, validating the results with Pavement design. It was concluded that MR7, 100% RAP mixture exhibits extremely high stiffness value at high frequency and low temperature. The results revealed that all four mixtures respect the time-temperature superposition principle with respect to the complex modulus. From a pavement design perspective, the moduli measured in this study do have a big impact. However, since different pavement structures are achieved with those different materials, the stiffest material, the CIR, ended up giving the least performant structure.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Gandi, Apparao
  • Carter, Alan
  • Singh, Dharamveer
• Conference:
  • Transportation Research Board 96th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2017-1-8 to 2017-1-12
• Date: 2017

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 14p
• Monograph Title: TRB 96th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Cold in-place recycling; Pavement performance; Reclaimed asphalt pavements; Recycled materials; Stiffness; Viscoelasticity
• Uncontrolled Terms: Complex modulus
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01622437
• Record Type: Publication
• Report/Paper Numbers: 17-00070
• Files: TRIS, TRB, ATRI
• Created Date: Jan 16 2017 5:06PM