DEVELOPMENT OF BINDER SPECIFICATION PARAMETERS BASED ON CHARACTERIZATION OF DAMAGE BEHAVIOR (WITH DISCUSSION)

In the current Superpave specification, G*/sin delta is used as an indicator for rutting resistance and G* sin delta is used as an indicator for fatigue behavior. Recent research efforts indicate that there are poor correlations between these parameters and the lab-measured rutting and fatigue performances of mixtures produced with modified binders. From this study, a new approach is introduced to evaluate damage behavior and use damage related parameters to rank binders with respect to their contribution to mixture behavior. Based on concepts introduced in previous studies, new test methods and new parameters are used to directly evaluate the damage behaviors of the modified binders. For the rutting parameter, the viscous component of the creep compliance, measured using a repeated creep test in the dynamic shear rheometer (DSR), is proposed. As for the fatigue parameter, the number of cycles to damage propagation, measured using a time sweep test in the DSR, is proposed. The results indicate that new parameters represent important improvements in the theoretical and practical concepts, which lead to a better rating of binder properties as related to damage behaviors of pavements.

Language

  • English

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Filing Info

  • Accession Number: 00925826
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 4 2002 12:00AM