Abstract
Fatigue cracking is one of the primary distresses of asphalt pavement. Critical strain energy density (CSED) has shown great potential to be a material parameter for fatigue cracking prediction. For the CSED to be used in future fatigue model and pavement design, a model is needed to predict the CSED as a function of the loading rate and the temperature, analogous to dynamic modulus. In this study, indirect tensile (IDT) tests were conducted to determine the properties of hot mixed asphalt at different loading rates and temperatures. It was found that time–temperature superposition principle is valid for IDT strength at both low and intermediate temperatures; and valid for failure strain and for the CSED at intermediate temperatures only. The shift factors for dynamic modulus were close to those of IDT strength and CSED, respectively. However, there was a discrepancy between shift factors of dynamic modulus and those of failure strain.
Notes
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