Modifying the Viscosity Based Witczak Model and Developing Phase Angle Predictive Model for New Mexico’s Superpave Mixes

This study modifies the viscosity (η) based Witczak dynamic modulus (|E*|) predictive equation which is used in the recently developed American Association of State Highway and Transportation Officials (AASHTO)Ware pavement Mechanistic-Empirical (ME) design software. A total of 21 Superpave (SP) mixtures with different gradations and binder grades were tested for |E*| at different temperatures and frequencies of loading. Results show that the η-based Witczak model underestimates the |E*| for New Mexico’s SP mixes. Therefore, revised model is developed using regression analysis. A phase angle (ϕ) predictive model is also developed using the ϕ-values obtained during the |E*| testing. It was found that the revised η- based Witczak model determines the |E*| more accurately compared to the original η-based Witczak model.

  • Supplemental Notes:
    • This paper was sponsored by TRB committee AFK50 Standing Committee on Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements. Alternate title: Modifying Viscosity-Based Witczak Model and Developing Phase Angle Predictive Model for New Mexico’s Superpave Mixes
  • Corporate Authors:

    Transportation Research Board

    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Authors:
    • Rahman, A S M A
    • Islam, Md Rashadul
    • Tarefder, Rafiqul A
  • Conference:
  • Date: 2016

Language

  • English

Media Info

  • Media Type: Digital/other
  • Monograph Title: TRB 95th Annual Meeting Compendium of Papers

Subject/Index Terms

Filing Info

  • Accession Number: 01594473
  • Record Type: Publication
  • Report/Paper Numbers: 16-3180
  • Files: TRIS, TRB, ATRI
  • Created Date: Jan 12 2016 5:25PM