Journal Published Online: 10 October 2014
Volume 43, Issue 5

Characterization of Strain Rate and Temperature-Dependent Shear Properties of Asphalt Mixtures



Shear properties (cohesion and angle of internal friction) are the main material parameters for the rutting evaluation of asphalt mixtures. The strain rate and temperature dependency of shear properties was characterized for three mixtures based on the time–temperature superposition principle (TTSP). The unconfined compression and indirect tension dynamic modulus tests were performed to measure the linear viscoelastic properties of asphalt mixtures by a modified procedure. The uniaxial compression strength test and indirect tension strength test were conducted at three temperatures and four strain rates to calculate shear properties of asphalt mixtures based on the Mohr–Coulomb failure theory. The strength and shear property master curves were developed using the shift factor obtained from the dynamic modulus tests. The analysis results show that TTSP is still valid for asphalt concrete in the damage state regardless of failure modes. The effect of confining pressure on shift factors can be evaluated by the Fillers–Moonan–Tschoegl (FMT) model. The mixture strength and shear properties exhibit a significant temperature and time dependency. The modified cross model can be used to describe the strength and cohesion master curves after slight improvement. Shear property master curves show preliminary promise for use in optimizing material design and improving the accuracy of rutting prediction.

Author Information

Li, Qiang
School of Civil Engineering, Nanjing Forestry Univ., Nanjing, CN
Ma, Xiang
School of Civil Engineering, Nanjing Forestry Univ., Nanjing, CN
Ni, Fujian
School of Transportation, Southeast Univ., Nanjing, CN
Li, Guofen
School of Civil Engineering, Nanjing Forestry Univ., Nanjing, CN
Pages: 14
Price: $25.00
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Stock #: JTE20140056
ISSN: 0090-3973
DOI: 10.1520/JTE20140056