Rutting resistance of direct coal liquefaction residuemodified asphalt pavement structure(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年1期
- Page:
- 21-29
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Rutting resistance of direct coal liquefaction residuemodified asphalt pavement structure
- Author(s):
- JI Jie1; 2; WANG Zhe1; HAO Jixiu3; XU Xinqiang1
- (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 100044, China;3. CCCC Investment Company Limited, Beijing 100029, China)
- Keywords:
- road engineering; DCLR modified asphalt; composite DCLR modified asphalt; middle course; rutting resistance
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the antirutting performance of the direct coal liquefaction residue (DCLR) modified asphalt pavement, based on the traffic environment survey data of Beixin (BeijingUrumqi) Expressway, rutting depth and dynamic stability were used as indicators, and ABAQUS simulation and APAD calculation were used to analyze the four asphalt mixtures (DCLR modified asphalt mixture, composite DCLR modified asphalt mixture, SK90 asphalt mixture and SBS modified asphalt mixture) in the same pavement structure (4 cm AC13 upper layer, 6 cm AC20 middle layer, 8 cm AC25 lower layer, 40 cm cement stabilized crushed stone base layer and 20 cm lime soil base layer) and different service life (1 year, 2 years, 5 years, 10 years, 15 years) under the rutting prediction, and through indoor rutting test and statistical inspection methods for performance verification and evaluation of simulation results. The results show that the theoretical prediction value is basically consistent with the actual test results. When the significance level is set to 0.05, there is no systematic error in the two rutting depth simulation calculation methods, that is, the rutting prediction is consistent.The rutting depths of the four asphalt pavement structures all increase linearly with the in service life increase, and the correlation coefficients are all above 0.9. Among them, the rutting growth rate of composite DCLR modified asphalt pavement is the slowest, followed by DCLR modified asphalt pavement, and the third is SBS modified asphalt pavement, the worst is SK90 asphalt pavement. Within 15 years of design life, compared with conventional SK90 asphalt pavements and SBS modified asphalt pavements, DCLR and composite DCLR modified asphalt pavements have reduced rutting by 40% to 60% and 30% to 50%, respectively, and their deformation resistance has been increased to 1.7 to 2.4 times and 1.4 to 2 times. That is, composite DCLR modified asphalt pavement has the best rutting resistance, DCLR modified asphalt pavement is stronger than SBS modified asphalt pavement, and SK90 asphalt pavement has the worst rutting resistance. 6 tabs, 8 figs, 29 refs.
Last Update: 2021-01-25