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Influence of Confinement Pressure on the Viscoelastic Response of Bituminous Mixtures
This investigation reports the use of stress-strain-time data for different frequencies at a given temperature for computing the retardation spectra. While the existing attempts use a master curve based approach with continuous relaxation spectra, the use of a discrete retardation spectrum at a given temperature directly computed from the model parameters can be useful and is devoid of the associated approximations. Such an approach also amplifies the difficulties related to identifying a unique Prony series parameters for a wide range of frequencies at any given temperature. A dense graded bituminous mixture prepared with an unmodified binder was used for the study. The tests were performed on cylindrical specimens with 100 mm diameter and 150 mm height. The specimens were tested at six frequencies, ranging from 25 to 1 Hz, for two temperatures, 5 and 35 °C, in unconfined condition as well as at a confinement pressure of 200 kPa. The stress-strain response at these frequencies and temperatures were used in the estimation of material parameters for a generalized Voigt-Kelvin model. Depending on the temperature, frequency of loading, and confinement pressure, a Prony series with a spectrum of retardation time was selected. The results show that at a given temperature, a single set of model parameters is not sufficient to describe the strain response at multiple frequencies. In addition, the Prony series coefficients are shown to vary significantly at 35 °C for the confined tests, while the difference between unconfined and confined tests are insignificant at 5 °C.
Influence of Confinement Pressure on the Viscoelastic Response of Bituminous Mixtures
This investigation reports the use of stress-strain-time data for different frequencies at a given temperature for computing the retardation spectra. While the existing attempts use a master curve based approach with continuous relaxation spectra, the use of a discrete retardation spectrum at a given temperature directly computed from the model parameters can be useful and is devoid of the associated approximations. Such an approach also amplifies the difficulties related to identifying a unique Prony series parameters for a wide range of frequencies at any given temperature. A dense graded bituminous mixture prepared with an unmodified binder was used for the study. The tests were performed on cylindrical specimens with 100 mm diameter and 150 mm height. The specimens were tested at six frequencies, ranging from 25 to 1 Hz, for two temperatures, 5 and 35 °C, in unconfined condition as well as at a confinement pressure of 200 kPa. The stress-strain response at these frequencies and temperatures were used in the estimation of material parameters for a generalized Voigt-Kelvin model. Depending on the temperature, frequency of loading, and confinement pressure, a Prony series with a spectrum of retardation time was selected. The results show that at a given temperature, a single set of model parameters is not sufficient to describe the strain response at multiple frequencies. In addition, the Prony series coefficients are shown to vary significantly at 35 °C for the confined tests, while the difference between unconfined and confined tests are insignificant at 5 °C.
Influence of Confinement Pressure on the Viscoelastic Response of Bituminous Mixtures
RILEM Bookseries
Di Benedetto, Hervé (editor) / Baaj, Hassan (editor) / Chailleux, Emmanuel (editor) / Tebaldi, Gabriele (editor) / Sauzéat, Cédric (editor) / Mangiafico, Salvatore (editor) / Abhijith, B. S. (author) / Atul Narayan, S. P. (author) / Murali Krishnan, J. (author)
RILEM International Symposium on Bituminous Materials ; 2020 ; Lyon, France
Proceedings of the RILEM International Symposium on Bituminous Materials ; Chapter: 137 ; 1079-1085
RILEM Bookseries ; 27
2021-09-26
7 pages
Article/Chapter (Book)
Electronic Resource
English
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