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Research on the response of bitumen binder and bitumen mastic to physical hardening effect based on rheological properties
https://orcid.org/0000-0002-8774-9932
Abstract Bitumen materials will occur a physical hardening effect when stored isothermally in a low-temperature environment, and ignoring the physical hardening factor has become one of the important reasons for premature cracking of asphalt pavement during the service period. This paper investigates the response of bitumen binder and bitumen mastic to physical hardening effects at different storage temperatures and times using the bending beam rheometer and dynamic shear rheometer. The response of the material to physical hardening effects is analyzed through temperature index system changes, mathematical model fitting, and stiffness master curve fitting. Results indicate that the response of the material to physical hardening effects can be classified into two stages: the rapid growth and the gradual stabilization periods. The response time of these two stages is related to factors such as aging degree and storage temperature. The physical hardening effect will cause the temperature loss of the material at low temperature, and its influence law on and is different. It is recommended to extend the isothermal storage time specified in the test from 1 h to 9 h, considering the time cost and the change in temperature index. Moreover, the stiffness master curve study revealed the occurrence of the "tail drift" phenomenon.
Highlights Physical hardening effects cause temperature loss in bitumen, even over a grade. Recommend extending BBR test storage to 9 h for better scientific validity. “Tail drift” occurs during the fitting of the stiffness master curve. The Logistic model can well fit the S and m values in the physical hardening process.
Research on the response of bitumen binder and bitumen mastic to physical hardening effect based on rheological properties
https://orcid.org/0000-0002-8774-9932
Abstract Bitumen materials will occur a physical hardening effect when stored isothermally in a low-temperature environment, and ignoring the physical hardening factor has become one of the important reasons for premature cracking of asphalt pavement during the service period. This paper investigates the response of bitumen binder and bitumen mastic to physical hardening effects at different storage temperatures and times using the bending beam rheometer and dynamic shear rheometer. The response of the material to physical hardening effects is analyzed through temperature index system changes, mathematical model fitting, and stiffness master curve fitting. Results indicate that the response of the material to physical hardening effects can be classified into two stages: the rapid growth and the gradual stabilization periods. The response time of these two stages is related to factors such as aging degree and storage temperature. The physical hardening effect will cause the temperature loss of the material at low temperature, and its influence law on and is different. It is recommended to extend the isothermal storage time specified in the test from 1 h to 9 h, considering the time cost and the change in temperature index. Moreover, the stiffness master curve study revealed the occurrence of the "tail drift" phenomenon.
Highlights Physical hardening effects cause temperature loss in bitumen, even over a grade. Recommend extending BBR test storage to 9 h for better scientific validity. “Tail drift” occurs during the fitting of the stiffness master curve. The Logistic model can well fit the S and m values in the physical hardening process.
Research on the response of bitumen binder and bitumen mastic to physical hardening effect based on rheological properties
https://orcid.org/0000-0002-8774-9932
Abstract Bitumen materials will occur a physical hardening effect when stored isothermally in a low-temperature environment, and ignoring the physical hardening factor has become one of the important reasons for premature cracking of asphalt pavement during the service period. This paper investigates the response of bitumen binder and bitumen mastic to physical hardening effects at different storage temperatures and times using the bending beam rheometer and dynamic shear rheometer. The response of the material to physical hardening effects is analyzed through temperature index system changes, mathematical model fitting, and stiffness master curve fitting. Results indicate that the response of the material to physical hardening effects can be classified into two stages: the rapid growth and the gradual stabilization periods. The response time of these two stages is related to factors such as aging degree and storage temperature. The physical hardening effect will cause the temperature loss of the material at low temperature, and its influence law on and is different. It is recommended to extend the isothermal storage time specified in the test from 1 h to 9 h, considering the time cost and the change in temperature index. Moreover, the stiffness master curve study revealed the occurrence of the "tail drift" phenomenon.
Highlights Physical hardening effects cause temperature loss in bitumen, even over a grade. Recommend extending BBR test storage to 9 h for better scientific validity. “Tail drift” occurs during the fitting of the stiffness master curve. The Logistic model can well fit the S and m values in the physical hardening process.
Research on the response of bitumen binder and bitumen mastic to physical hardening effect based on rheological properties
Tan, Xiaoyong (author) / Huang, Guojing (author) / Li, Xiang (author) / Zhang, Mingliang (author) / Ma, Xuejun (author) / Zhang, Jiupeng (author)
2024-01-01
Article (Journal)
Electronic Resource
English
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