Evaluation of Modified Binders

The report pertains to the laboratory evaluation of hot mix asphalt modifiers (HMA-M). These modifiers are defined as materials that are added to hot mix asphalt (HMA) to improve its working capacity, whether for permanent deformation, fatigue/low temperature cracking, or both. The HMA-M is not a standard, approved material for the New Jersey Department of Transportation (NJDOT). They are typically materials that customers bring to the NJDOT, with the understanding that the HMA-M would improve the working capacity of the HMA. However, the extent of the improvement is unknown. Therefore, a methodology to evaluate the extent of the improvement was necessary. And since the additives involved in this study claimed to aid in the rut resistance of the HMA, the performance testing focused on the mixes' resistance to permanent deformation. A total of six binders were evaluated in the study. Three of the binders were NJDOT approved materials and were used as baseline comparisons. They were a PG64-22 from Citgo, and a PG76-22 from both Citgo and Koch Materials. The three HMA-M evaluated in the study were: (1) Eastman's EE-2 polymer additive, (2) Creanova's Vestoplast polymer additive, and (3) Hydrocarbon Technology's Carbon Black. The HMA-M were added to the PG64-22 baseline sample by using the manufacturer's recommended procedures. This allowed for the direct comparison between the initial mix (PG64-22) and the modified mix. The two PG76-22 mixes were used as a high end comparison. All additives and binders were mixed to make a 12.5mm Coarse Superpave mix designed for heavy traffic (3 to 30 million ESALs). The compacted samples were tests in the Asphalt Pavement Analyzer (APA), Superpave Shear Tester (SST), under the Repeated Shear (RSCH), Frequency Sweep (FSCH), and Simple Shear (SSCH) test modes. The results showed that the SST test was extremely useful at evaluating HMA-M for stiffness, creep, and permanent deformation. RSCH and APA results compared favorably, as did the FSCH and binder test results. The Creanova Vestoplast HMA-M ranked as the best HMA-M tested, however, the Vestoplast did not perform as well as either of the PG76-22 mixes. An evaluation procedure and test parameters are recommended for future use of evaluating HMA-M.

• Record URL:
  http://cait.rutgers.edu/files/FHWA-NJ-2003-017.pdf
• Record URL:
  http://www.nj.gov/transportation/business/research/reports/FHWA-NJ-2003-017.pdf
• 
• Summary URL:
  http://www.nj.gov/transportation/business/research/reports/FHWA-NJ-2003-017-TB.pdf
• Corporate Authors:

  Center for Advanced Infrastructure and Transportation

  Rutgers University
  100 Brett Road
  Piscataway, NJ  United States  08854-8058

  New Jersey Department of Transportation

  Bureau of Research, 1035 Parkway Avenue, P.O. Box 600
  Trenton, NJ  United States  08625-0600

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Research and Innovative Technology Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Bennert, Thomas
  • Maher, Ali
  • 0000-0001-9083-9317
  • Gucunski, Nenad
• Publication Date: 2003-3

Language

• English

Media Info

• Media Type: Print
• Edition: Final Report
• Features: Appendices; Figures; References; Tables;
• Pagination: 213p

Subject/Index Terms

• TRT Terms: Additives; Asphalt mixtures; Cracking; Creep; Deformation; Equivalent single axle loads; Evaluation; Fatigue (Mechanics); Hot mix asphalt; Improvements; Performance tests; Ruts (Pavements); Stiffness; Superpave
• Identifier Terms: Asphalt Pavement Analyzer; PG64-22; PG76-22
• Uncontrolled Terms: Modified binders
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01001433
• Record Type: Publication
• Report/Paper Numbers: FHWA-NJ-2003-017
• Files: UTC, TRIS, USDOT, STATEDOT
• Created Date: Jun 28 2005 3:26PM