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A practical shear rate on modified asphalt binders for optimum compaction temperature determination in asphalt mixture design

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Abstract

This paper is attempted to establish a practical shear rate for optimum compaction temperature determination of modified asphalt binders in asphalt mixture design. Viscosity of seven modified asphalt binders was measured, optimum compaction temperatures of eight asphalt mixtures were obtained and the shear rate range during roller compaction was estimated. Results showed that in the shear rate measuring range of commonly used Brookfield viscometer (0.3–25 s−1), viscosity characteristics at 25 s−1 showed the best similarity to viscosity characteristics during roller compaction in the shear rate range of 10–130 s−1. Also, viscosity at the shear rate of 25 s−1 exhibited the best correlation with the minimum compaction energy index of asphalt mixtures at optimum compaction temperatures. Based on the results above, 25 s−1 was suggested as the practical shear rate, providing a direct viscosity measurement for optimum compaction temperature determination of modified asphalt binders in asphalt mixture design.

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Acknowledgments

The authors would like to acknowledge Hussain U. Bahia, who provided the initial idea for this research. The authors would also like to acknowledge Xurong Ma, who conducted a part of viscosity test for this research.

Funding

This study was funded by Science and Technology Commission of Shanghai Municipality (grant number 12231205302 and grant number 16DZ1202000).

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Authors and Affiliations

  1. College of Transport and Communications, Shanghai Maritime University, 1550 Haigang Ave, Shanghai, 201306, People’s Republic of China

    Han Geng

  2. Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, 1239 Siping Road, Shanghai, 200092, People’s Republic of China

    Han Geng & Lihan Li

Authors
  1. Han Geng
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  2. Lihan Li
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Correspondence to Han Geng.

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Geng, H., Li, L. A practical shear rate on modified asphalt binders for optimum compaction temperature determination in asphalt mixture design. Mater Struct 50, 61 (2017). https://doi.org/10.1617/s11527-016-0938-x

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