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Influence of Rest Period on the Fatigue Response of Bituminous Mixture at Low Temperature
, Pugazhenthi Ayyar, S. Lakshmi, A. Padmarekha
Published in Springer
2019
Volume: 12
   
Issue: 6
Pages: 674 - 681
Abstract
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 [1] and normalized modulus by ASTM D7460 [2] 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. © 2019, Chinese Society of Pavement Engineering. Production and hosting by Springer Nature.
About the journal
JournalData powered by TypesetInternational Journal of Pavement Research and Technology
PublisherData powered by TypesetSpringer
ISSN19966814
Open AccessNo
Concepts (17)
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    Bending tests
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    BITUMINOUS MATERIALS
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    Energy dissipation
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    Fatigue of materials
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    Fatigue testing
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    Mixtures
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    Stiffness
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    Temperature
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    BEAM BENDING
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    BITUMINOUS MIXTURES
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    FATIGUE LIFE ESTIMATION
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    Fatigue test method
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    Low temperatures
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    REST PERIODS
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    STIFFNESS MODULI
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    STRAIN-CONTROLLED MODE
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    Thermal fatigue