Influence of Rest Period on the Fatigue Response of Bituminous Mixture at Low Temperature
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Laboratory fatigue characterization of bituminous mixtures is carried out typically by conducting a beam bending test at a given frequency and temperature for various strain/stress levels. In the current fatigue test methods, the material is tested at 20°C with continuous loading, and the fatigue life is estimated based on the stiffness modulus and energy dissipation. Very little data exist on the influence of low temperature (0°C), and tests with a rest period.
In this study, the fatigue life of the bituminous mixture is estimated at 20 and 0°C, and the influence of the rest period is quantified. For this purpose, a typical bituminous mixture used in Indian highways was fabricated. Experiments were conducted at 0 and 20°C with and without a rest period in strain-controlled mode (600 and 800 microstrains) in a four-point beam bending test setup. For tests with a rest period, a 0.9 s rest period was provided after 0.1 s loading. The evolution of stiffness modulus as per AASHTO T321  and normalized modulus by ASTM D7460  was used in fatigue life estimation. Also, the evolution of energy dissipation during testing was analyzed to characterize the response of material (elastic/viscoelastic) and the beneficial effect of the rest period, if any. The influence of the rest period was more pronounced when tested at 20°C in comparison to testing at 0°C.
KeywordsFour-point beam bending test Low temperature Rest period Stiffness modulus Energy dissipation Fatigue life
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The authors thank Department of Science and Technology, Govt. of India (Grand number: DST/TSG/STS/2011/46) for funding and M/s IPC Global, Australia for the technical support provided during the research work.
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