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Linear Viscoelastic Limits for Aged and Unaged Bitumen
The bitumen exhibits linear or nonlinear behavior, and the linear limit for loading is expected to vary with frequency, aging condition, and temperature of the material. The material characteristics such as dynamic modulus and phase lag can be meaningfully measured only when tested in a linear regime. This paper attempts to delineate the linear and nonlinear characteristics of the unaged and long-term aged bitumen under different test conditions. Two different binders of VG10 and VG30 grade as per IS73, 2018, were used to identify the linear and nonlinear behavior of bitumen material in the temperature range of 20–60 °C. Oscillatory shearing was applied to all the material using the dynamic shear rheometer. The strain amplitude during shear was linearly ramped from 0.01 to 15% at a rate of 0.01% s−1, and the test was performed at 1, 5, and, 10 Hz frequency. The test was performed at different temperatures of 20, 30, 40, 50, and 60 °C. The linear and nonlinear limits were established based on dynamic modulus and torque. The linear viscoelastic limits were found to vary with the aging condition, frequency, and temperature of the test. The linear limit established from torque derivative was found to be on the lower side when compared with ASTM D7175, 2015 test protocol based on dynamic modulus.
Linear Viscoelastic Limits for Aged and Unaged Bitumen
The bitumen exhibits linear or nonlinear behavior, and the linear limit for loading is expected to vary with frequency, aging condition, and temperature of the material. The material characteristics such as dynamic modulus and phase lag can be meaningfully measured only when tested in a linear regime. This paper attempts to delineate the linear and nonlinear characteristics of the unaged and long-term aged bitumen under different test conditions. Two different binders of VG10 and VG30 grade as per IS73, 2018, were used to identify the linear and nonlinear behavior of bitumen material in the temperature range of 20–60 °C. Oscillatory shearing was applied to all the material using the dynamic shear rheometer. The strain amplitude during shear was linearly ramped from 0.01 to 15% at a rate of 0.01% s−1, and the test was performed at 1, 5, and, 10 Hz frequency. The test was performed at different temperatures of 20, 30, 40, 50, and 60 °C. The linear and nonlinear limits were established based on dynamic modulus and torque. The linear viscoelastic limits were found to vary with the aging condition, frequency, and temperature of the test. The linear limit established from torque derivative was found to be on the lower side when compared with ASTM D7175, 2015 test protocol based on dynamic modulus.
Linear Viscoelastic Limits for Aged and Unaged Bitumen
Lecture Notes in Civil Engineering
Anjaneyulu, M. V. L. R. (editor) / Harikrishna, M. (editor) / Arkatkar, Shriniwas S. (editor) / Veeraragavan, A. (editor) / Srikanth, T. (author) / Padmarekha, A. (author)
Recent Advances in Transportation Systems Engineering and Management ; Chapter: 19 ; 275-284
2022-11-11
10 pages
Article/Chapter (Book)
Electronic Resource
English
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