01333285

Component

https://doi.org/10.3141/2210-14

http://scholar.google.com...Timm&publication_year=2011

Mechanistic–empirical pavement design has recently come to the forefront of design, with many states looking to the Mechanistic–Empirical Pavement Design Guide (MEPDG) as their future primary design method. Central to any flexible pavement mechanistic–empirical design framework is the characterization of hot-mix asphalt (HMA) through the use of dynamic modulus E*. Because expensive and specialized equipment is required to measure E* in the laboratory, predictive E* equations that use binder and mixture properties to estimate E* at various frequencies and temperatures must be evaluated. There are currently three global E* predictive equations, two of which are used at Levels 2 and 3 in the MEPDG. These three models (Witczak 1-37A, Witczak 1-40D, and Hirsch) were evaluated with the use of 18 HMA plant-produced, lab-compacted mixtures (representative of general-use mixtures used in the southeastern United States) that were placed at the 2006 National Center for Asphalt Testing test track. E* predictions were made at three temperatures and three frequencies for direct comparison with measured values. The Witczak models had the greatest deviation from measured values, and the Witczak 1-40D model overestimated E* by approximately 61%. The Hirsch model most accurately predicted the moduli for the 2006 test track mixtures. Calibration of the Hirsch model for these mixtures indicated that the Poisson ratio selected for the asphalt binder had little effect on its prediction capabilities. The little improvement resulting from calibration proves that this step is unnecessary.

01356813

11-4070

English

pp 122-129

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167468

Print

Figures (5) ; References (14) ; Tables (3)

Asphalt mixtures; Dynamic modulus of elasticity; Equations; Hot mix asphalt; Mathematical models

Mechanistic-Empirical Pavement Design Guide

Southeastern United States

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Feb 17 2011 6:44PM

• Determination of Crack Size Distribution in Asphalt Mixtures
• Determination of Flow Number in Asphalt Mixtures from Deformation Rate During Secondary State
• Effect of Thermal Stresses on Fatigue Behavior in Bituminous Mixes
• Effects of Asphalt Mixture Properties on Permanent Deformation Response
• Effects of Nonuniform and Three-Dimensional Contact Stresses on Near-Surface Cracking
• Evaluation of Fracture Toughness of Semirigid Asphalt Concretes at Low Temperatures
• Evaluation of Predictive Models for Estimating Dynamic Modulus of Hot-Mix Asphalt in Oklahoma
• Factors That Affect Cracking Performance in Hot-Mix Asphalt Mix Design
• Laboratory Evaluation of Asphalt Binders and Mixtures Containing Polyphosphoric Acid
• Permanent Deformation Model Based on Shear Properties of Asphalt Mixtures: Development and Calibration
• Reduced Testing Protocol for Measuring the Confined Dynamic Modulus of Asphalt Mixtures
• Search for a Laboratory Test to Evaluate Crack Resistance of Hot-Mix Asphalt
• Significance of Confined Dynamic Modulus Laboratory Testing for Asphalt Concrete: Conventional, Gap-Graded, and Open-Graded Mixtures