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Investigation on the Short-Term Aging Scheme for High Viscosity Modified Bitumen
Chengwei Xing1,2, Juze Qin3, Zhiqiang Cheng4,5
1Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, South 2nd Ring Road Middle Section, Xi'an 710064, China.
Materials (Basel, Switzerland)
|June 10, 2023
Summary
Developing new short-term aging methods for high viscosity modified bitumen (HVMB) is crucial. This study recommends aging HVMB using the thin-film oven test (TFOT) for 5 hours at 178°C.
Area of Science:
- Materials Science
- Civil Engineering
- Asphalt Technology
Background:
- Standard short-term aging methods are inadequate for high viscosity modified bitumen (HVMB) due to its unique properties.
- Effective aging simulation is essential for predicting the performance of HVMB in asphalt mixtures.
Purpose of the Study:
- To establish a suitable laboratory short-term aging scheme for high viscosity modified bitumen (HVMB).
- To optimize aging period and temperature for HVMB to accurately simulate field conditions.
Main Methods:
- Aging of two commercial HVMB types using Rolling Thin-Film Oven Test (RTFOT) and Thin-Film Oven Test (TFOT) at varied conditions.
- Aging of Open-Graded Friction Course (OGFC) mixtures containing HVMB to mimic plant mixing.
- Rheological property evaluation of aged bitumen (aged and extracted) using temperature sweep, frequency sweep, and multiple stress creep recovery tests.
Main Results:
- The Thin-Film Oven Test (TFOT) proved more suitable for HVMB than RTFOT.
- Aging OGFC mixtures in a 175°C forced-draft oven for 2 hours effectively simulates short-term aging at the mixing plant.
- Optimal TFOT parameters for HVMB were determined as 5 hours at 178°C.
Conclusions:
- A refined TFOT protocol (5 hours at 178°C) is recommended for short-term aging of HVMB.
- The proposed method provides a more accurate simulation of bitumen aging during the mixing plant process.
- This research contributes to improved material characterization and performance prediction for HVMB in pavement engineering.
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