Development of a Design Methodology for Asphalt Treated Mixtures

This report summarizes the results of a study that was conducted to develop a simplified design methodology for asphalt treated mixtures that are durable, stable, constructible, and cost effective through the examination of the performance of mixtures that have different aggregate gradation from typically available sources. The study was conducted in two parallel parts, Part I and Part II. Part I consisted of developing a design methodology for asphalt treated mixtures and conducting a laboratory testing program to characterize the behavior of the designed mixtures. Eight aggregate sources and two types of asphalt binders were considered in this part. Part I of this study also included conducting static as well as repeated load triaxial tests to characterize the performance of three unbound granular base materials. Furthermore, a parametric analysis was conducted using Mechanistic Empirical Pavement Design Guide (MEPGD) software to evaluate the benefits of in corporating the asphalt treated mixtures in the design of a pavement structure. In Part II four overlay rehabilitation projects were selected in Louisiana to evaluate the constructability and in-situ proprieties of the asphalt treated mixtures designed in Part I. The results of Part I showed that the asphalt treated mixtures containing limestone aggregates, LS I and LS II, had the best laboratory performance among all other mixtures designed in this study. Furthermore, their performance was similar to conventional base course hot mix asphalt (HMA) ones at high and intermediate temperatures. The results of the laboratory tests conducted in Part I also showed that the asphalt treated base mixtures have made significant improvements over unbound granular base materials in terms of stiffness and permanent deformation resistance. In addition, the MEPDG analysis showed asphalt treated mixtures can be used to extend the service life and/or reduce the design thickness of a pavement structure. The results of Part II of this study demonstrated that the asphalt treated mixtures can be successively produced in conventional HMA plants and constructed in the field. In addition, the in-situ test results showed that asphalt treated mixtures exhibited similar moduli to those of conventional HMA base course mixtures.

• Record URL:
  • http://www.ltrc.lsu.edu/pdf/2013/FR_453.pdf
• 
• Summary URL:
  • http://www.ltrc.lsu.edu/pdf/2013/ts_453.pdf
• Corporate Authors:

  Louisiana Transportation Research Center

  4101 Gourrier Avenue
  Baton Rouge, LA  United States  70808

  Louisiana Department of Transportation

  P.O. Box 94245
  1201 Capitol Access Road
  Baton Rouge, LA  United States  70804-9245

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Mohammad, Louay N
  • Nazzal, Munir D
  • King, Bill
  • Austin, Aaron
• Publication Date: 2013-12

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final report
• Features: Figures; References; Tables;
• Pagination: 93p

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Binders; Deformation; Field tests; Mechanistic-empirical pavement design; Overlays (Pavements); Pavement design; Pavement performance
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I30: Materials;

Filing Info

• Accession Number: 01504348
• Record Type: Publication
• Report/Paper Numbers: FHWA/LA.09/453, LTRC Project Number: 04-4B, State Project Number: 736-99-1449
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jan 24 2014 2:29PM