Laboratory Evaluation of the Performance of HMA mixtures containing Thiopave additives

The objective of this study was to compare the laboratory mechanistic properties of sulfur-modified warm mix asphalt (WMA) to conventional asphalt mixtures. Three mixtures, two hot mix asphalt (HMA) and one WMA, were prepared. The first mixture included an unmodified asphalt binder classified as PG 64-22, the second mixture contained a styrene butadiene styrene (SBS) elastomeric modified binder classified as PG 70-22, and the third mixture was a WMA that incorporated a sulfur-based mix additive and PG 64-22 binder. A suite of tests were performed to evaluate the rutting performance, moisture resistance, fatigue endurance, fracture resistance, and thermal cracking resistance of the three mixtures. Results of the experimental program showed that the rutting performance of sulfur-modified WMA was comparable or superior to conventional mixes prepared with polymer-modified and unmodified asphalt binders. Results of the modified Lottman test showed that the moisture resistance of the sulfur-modified mixture was comparable to conventional mixes. Additionally, fracture and fatigue properties, as measured by the semi-circular bend (SCB) and beam fatigue tests, show that the sulfur-modified WMA mixture possessed stiffer properties than that of a conventional polymer-modified mixture. Thermal stress restrained specimen test (TSRST) test results showed that the sulfur-modified WMA had a greater fracture stress than the polymer-modified mixture. However, there was no statistical significance between the average fracture temperatures for the mixes tested.

  • Record URL:
  • Supplemental Notes:
    • Cover title: Mechanistic Evaluation of Asphalt Mixtures Containing Thiopave Additives.
  • Corporate Authors:

    Louisiana Transportation Research Center

    Baton Rouge, LA  United States 

    Louisiana Department of Transportation and Development

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

    Shell Oil USA

    Houston, TX  United States 

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Mohammad, Louay N
    • Cooper III, Samuel B
    • Elseifi, Mostafa
  • Publication Date: 2016-4


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 56p

Subject/Index Terms

Filing Info

  • Accession Number: 01605607
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/LA.12/500, LTRC Project Number: 10-5B
  • Contract Numbers: State Project Number: 736-99-1653
  • Created Date: Jul 18 2016 8:36AM