Laboratory testing and economic analysis of high RAP warm mixed asphalt.
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Laboratory testing and economic analysis of high RAP warm mixed asphalt.

Filetype[PDF-1.79 MB]

  • English

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      Final report.
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ; NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ;
    • Abstract:
      This report contains laboratory testing, economic analysis, literature review, and information obtained from multiple producers throughout the state of Mississippi regarding the use of high RAP (50 % to 100%) mixtures containing warm mix additives. The goal of the research was to determine if such a concept was feasible within Mississippi, The project was broad in context and provides information related to many parameters. The result of the research was the concept was feasible.

      Economic data was obtained from ten producers in October of 2008 and used in conjunction with Mississippi virgin asphalt price records to perform economic analysis regarding high RAP mixtures, as well as issues pertaining to warm mix additives. The analysis was not comprehensive but provided valuable information. The result was there was no evidence to suggest the concept would be prohibited by economics.

      Laboratory testing was performed on hundreds of gyratory compacted samples with varying RAP contents, RAP sources, Sasobit® contents, virgin asphalt quantities, and temperature to investigate compactability and indirect tensile strength of the samples. The results provided no evidence that acceptable air voids could not be achieved at warm mix temperatures using only moderate amounts of virgin asphalt. Indirect tensile strengths were much greater in high RAP mixtures, which could indicate cracking potential. More research is needed to make definitive statements.

      Multiple producers of asphalt within Mississippi were contacted to discuss issues related to increased RAP percentage and the use of warm mix additives. The data provided was incorporated into select portions of the research. Overall, the research found no reason to believe that high RAP warm mixed asphalt was not feasible and recommended additional research that would further the cause.

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