Modified Asphalt Binders in Mixtures - Topical Report: Permanent Deformation Using A Mixture With Diabase Aggregate
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Modified Asphalt Binders in Mixtures - Topical Report: Permanent Deformation Using A Mixture With Diabase Aggregate

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  • English

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    • Alternative Title:
      Understanding the Performance of Modified Asphalt Binders in Mixtures: Permanent Deformation Using a Mixture With Diabase Aggregate [Title from Technical Report Documentation Page]
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    • Edition:
      Final Report, October 2000 - December 2001
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    • Abstract:
      The objective of this study was to determine if the Superpave high-temperature properties of polymer-modified asphalt binders correlate to asphalt mixture rutting resistance. An emphasis was placed on evaluating the rutting resistances of mixtures containing polymer-modified asphalt binders with identical (or close) performance grades (PGs), but varied polymer chemistries. This would indicate what types of modification provide properties that are, or are not, correctly captured by the current Superpave asphalt binder specification. Eleven asphalt binders were obtained for this study: two unmodified asphalt binders, an air-blown asphalt binder, and eight polymer-modified asphalt binders. Five binders used in a prior study were also tested. Asphalt binder properties were measured by a dynamic shear rheometer. Mixture rutting resistance was measured by: (1) G* and G*/sin(delta) from the Superpave Shear Tester (SST) frequency sweep at constant height, (2) cumulative permanent shear strain from the SST repeated shear at constant height (RSCH), (3) French Pavement Rutting Tester (French PRT), and (4) the Hamburg Wheel-Tracking Device. Cumulative permanent shear strain and the French PRT were the primary tests because they were specifically developed to measure rutting resistance. The high-temperature properties of the 11 asphalt binders had a high correlation to mixture rutting resistance as measured by the cumulative permanent shear strains. A weak correlation was found using the French PRT. Both correlations were high when analyzing the data from all 16 asphalt binders. A change in high-temperature PG from 70 to 76 significantly increased rutting resistance based on both tests. The main objective of this study was to determine which asphalt binders provide high-temperature properties that do not agree with mixture rutting resistance. In general, the number of discrepancies was low. It is recommended that the asphalt binders be tested using other aggregate types or gradations.
    • Content Notes:
      The original format of this document was an active HTML page(s). The Federal Highway Administration converted the HTML page(s) into an Adobe Acrobat PDF file to preserve and support reuse of the information it contained. The intellectual content of this PDF is an authentic capture of the original HTML file. Hyperlinks and other functions of the HTML webpage may have been lost, and this version of the content may not fully work with screen reading software.
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