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Title:

Influence of MEPDG Binder Characterization Input Level on Predicted Dynamic Modulus for Idaho Asphalt Concrete Mixtures

Accession Number:

01333300

Record Type:

Component

Abstract:

The current version of the Mechanistic-Empirical Pavement Design Guide (MEPDG) includes two different models for the hot-mix asphalt (HMA) dynamic modulus (E*) prediction. In MEPDG levels 2 and 3 hot mix asphalt (HMA) stiffness characterization; users can choose either one of these two models. The first model is the NCHRP1-37A viscosity-based model while the second one is the NCHRP1-40D binder shear modulus-based model. The main difference between the two models is the binder stiffness characterization parameter. Moreover, MEPDG allows users to choose between three hierarchical input levels for binder stiffness characterization. This paper focuses on the evaluation of the influence of the binder characterization input level on the prediction accuracy of the MEPDG E* predictive models. In this study, a total of 22 HMA mixtures commonly used in Idaho with six binder grades were investigated. Binder characterization data were obtained from Brookfield viscosity testing for MEPDG level 1 analysis for conventional binders, Dynamic Shear Rheometer (DSR) testing for MEPDG level 1 analysis for Superpave binders, and typical MEPDG values (MEPDG level 3 analysis). Comparison between laboratory measured and predicted E* values along with the three investigated binder characterization cases, revealed that both MEPDG E* predictive models resulted in reasonable E* predictions. The 1-37A E* model along with MEPDG level 3 binder inputs yielded the most accurate and least biased E* estimates for Idaho mixtures. Nevertheless, the lowest prediction accuracy and highest bias in the E* estimates, especially at the higher temperatures, resulted from the 1-40D model with MEPDG level 3 binder characterization.

Monograph Accession #:

01329018

Report/Paper Numbers:

11-1268

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Awed, Ahmed
El-Badawy, Sherif M
Bayomy, Fouad M
Santi, Michael J

Pagination:

19p

Publication Date:

2011

Conference:

Transportation Research Board 90th Annual Meeting

Location: Washington DC, United States
Date: 2011-1-23 to 2011-1-27
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Maps; References (17) ; Tables (6)

Geographic Terms:

Idaho

Subject Areas:

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

Source Data:

Transportation Research Board Annual Meeting 2011 Paper #11-1268

Files:

TRIS, TRB

Created Date:

Feb 17 2011 5:44PM