Effects of Recycled Asphalt Pavement on Mix and Binder Properties and Performance in the Laboratory

This study examines the effects of Recycled Asphalt Pavement (RAP) on the structural properties and performance of Hot-Mix Asphalt (HMA) and rheological properties of asphalt binder in the laboratory. As a first step, dynamic modulus (|E*|) and indirect tensile strength (ITS) tests are conducted on a set of HMA samples prepared with RAP and another set of HMA samples without RAP. Moisture susceptibility of RAP and without RAP samples are evaluated by |E*| ratio of wet to dry conditioned samples. Bending Beam Rheometer (BBR) test and Direct Tension Test (DTT) are conducted on virgin binder, extracted binder and RAP and aggregate mastics (mixture of binder and passing #200 to #50 sieves RAP and aggregate) to evaluate the low-temperature cracking. Results show that RAP materials have positive impact on |E*|, negative impact on ITS, and negligible effect on moisture susceptibility. The RAP samples produce 15% less permanent strain while |E*| testing than samples without RAP, which means that the RAP mixes are less susceptible to rutting. However, RAP mixed binder is more susceptible to the low-temperature cracking measured by m-value (slope of the stiffness versus time curve) and brittleness.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK30 Characteristics of Nonasphalt Components of Asphalt Paving Mixtures.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Islam, Rashadul Md
  • Mannan, Umme Amina
  • Rahman, Asm Asifur
  • Tarefder, Rafiqul A
• Conference:
  • Transportation Research Board 93rd Annual Meeting
  • Location: Washington DC
  • Date: 2014-1-12 to 2014-1-16
• Date: 2014

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 19p
• Monograph Title: TRB 93rd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Bituminous binders; Dynamic modulus of elasticity; Hot mix asphalt; Pavement performance; Recycled materials; Rheological properties; Tensile strength
• Uncontrolled Terms: Structural properties
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01519715
• Record Type: Publication
• Report/Paper Numbers: 14-4748
• Files: TRIS, TRB, ATRI
• Created Date: Mar 26 2014 10:07AM