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:
  • Transportation Research Board 95th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2016-1-10 to 2016-1-14
• Date: 2016

Language

• English

Media Info

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

Subject/Index Terms

• TRT Terms: Asphalt concrete; Dynamic modulus of elasticity; Mathematical prediction; Regression analysis; Superpave; Viscosity
• Uncontrolled Terms: Phase angle; Predictive models; Witczak model
• Geographic Terms: New Mexico
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01594473
• Record Type: Publication
• Report/Paper Numbers: 16-3180
• Files: TRIS, TRB, ATRI
• Created Date: Mar 24 2016 10:49AM