Rheological properties of asphalt binder modified by tetrahydrofuran soluble extracted from direct coal liquefaction residue(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年04期
- Page:
- 9-17
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Rheological properties of asphalt binder modified by tetrahydrofuran soluble extracted from direct coal liquefaction residue
- Author(s):
- JI Jie1; 2; LI Hui1; XU Ying1; 2; SHI Yuefeng3; SUO Zhi1; 2
- (1. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; 2. Beijing Advanced Innovation Center for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; 3. Railway Engineering Research Institute, China Academy of Railway Sciences Co., Ltd., Beijing 100081, China)
- Keywords:
- road engineering; THFS modified asphalt; rheological property; temperature sweep; frequency sweep; CAM model
- PACS:
- -
- DOI:
- -
- Abstract:
- To research the rheological properties of tetrahydrofuran soluble (THFS)extracted from direct coal liquefaction residue (DCLR), as a modified asphalt binder，asphalt binders with different tetrahydrofuran soluble (THFS) content (0%, 4%, 6%, 8% and 10% by weight of SK90) were prepared. First, the linear viscoelastic range was determined through strain sweep, and then, the test results of rutting factor, fatigue factor, creep rate and creep modulus were obtained within the linear viscoelastic range of the asphalt binder, using a dynamic shear rheometer (DSR) and bending beam rheometer (BBR) test. Finally, the physical parameters of a CAM model were integrated and used, which is a mathematical model for describing the wide temperature and wide frequency domains master curve of different asphalt materials under dynamic shearing, to analyze the rheological properties of the asphalt binder. The results show that with an increase in the THFS content, high temperature stability and temperature susceptibility improve, however, there is a decline in the lowtemperature and fatigue performances. According to the timetemperature equivalence principle, a modulus master curve of the THFS modified asphalt was synthesized at 45 ℃，and the CAM model was used to fit it, the fitting judgment coefficient R2 is found to be above 0.999. The viscoelastic properties of the THFS modified asphalt is evaluated using physical parameters in the CAM model. It is found that the temperature sensitivity of the modified asphalt decreases with an increase in THFS content, and it can be better adapted to changes in the pavement temperature. Therefore, the optimal THFS content is recommended to be within 6%, according to its comprehensive properties. 7 tabs, 10 figs, 25 refs.
Last Update: 2019-07-29