01373243

Component

The dynamic modulus, E*, is a significant property of hot mix asphalt (HMA). The dynamic modulus identifies the viscoelastic characteristics of HMA under repeated dynamic loading. Mixture properties (aggregate gradation and volumetric), rate of loading, and environmental conditions are the most important factors that affect the E* values. The main objective of this study was to develop a rational approach to investigate the effect of air voids and asphalt content on the change or the shifting of the E* master curves. In this study, E* tests were conducted on three asphalt concrete mixtures with different binder grades (PG 58-28, PG 64-22, and PG 76-16). For each mixture, eighteen specimens were tested to represent nine factor combinations based on three air voids and three asphalt contents with two replicates for each factor combination. The air voids and binder content levels were varied relative to the Superpave mix design and E* master curves were established. Based on the results, a proposed approach was introduced to accurately predict the change or the shifting in the E* master curve due to the variation of air voids and asphalt content. The application of this approach would be most beneficial in quality control/quality assurance purposes and for estimating contractor’s incentives and penalties, where E* is utilized to predict the pavement performance.

01362476

12-0844

English

19p

2012

Transportation Research Board 91st Annual Meeting

Digital/other

Figures; References; Tables

Air voids; Asphalt concrete; Asphalt content; Dynamic modulus of elasticity; Hot mix asphalt; Pavement performance

Design; Pavements; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2012 Paper #12-0844

TRIS, TRB

Feb 8 2012 4:57PM