Development of dynamic modulus master curves for hot-mix asphalt with abbreviated testing temperatures

Abstract

This paper describes an abbreviated testing temperature (ABBREV) approach for developing dynamic modulus (|E*|) master curves for hot-mix asphalt (HMA). The ABBREV approach uses three instead of the five standard temperatures required under AASHTO TP 62. Testing at the lowest and highest temperatures as specified under AASHTO TP 62 is not required. Potential savings in testing time were a key motivation for the study. Using a database of |E*| from up to 36 HMA mixtures, we developed regression models to estimate the |E*| at the lowest and highest testing temperatures. By combining the predicted |E*| at the lowest and highest temperatures with measured |E*| at intermediate temperatures (4, 21 and 38°C), we found the ABBREV master curves to be comparable with those of AASHTO TP 62. The results suggest that |E*| master curve for HMA could be developed without the need to conduct tests at the lowest and highest testing temperatures recommended under AASHTO TP 62.

Keywords:

• hot-mix asphalt
• dynamic modulus
• master curve

Acknowledgements

The authors acknowledge the assistance of the following Virginia Transportation Research Council personnel in this study: Donnie Dodds and Troy Deeds for material testing and Linda Evans for assistance with the editorial process.

Notes

1. Email: [email protected]

2. Email: [email protected]

Additional information

Notes on contributors

Brian K. Diefenderfer

1

Stacey D. Diefenderfer

2