Performance improvement technical of rubber modified asphalt
based on polyoctene/sulfur
(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年1期
- Page:
- 77-86
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Performance improvement technical of rubber modified asphalt
based on polyoctene/sulfur
- Author(s):
- XIONG Jianping1; 2; LIU Cong3; ZHANG Mingyue4; ZHOU Zhimi1; 2
- 1. Guangxi Key Lab of Road Structure and Materials, Guangxi Transportation Research and Consulting CO.,LTD., Nanning 530007, Guangxi, China; 2. Research and Development Center on Technologies, Materials andEquipment of High Grade Highway Construction and Maintenance Ministry of Transport, Guangxi TransportationResearch and Consulting CO., LTD., Nanning 530007, Guangxi, China;
- Keywords:
- road engineering; rubber asphalt; polyoctene; sulfur; preparation process; performance evaluation
- PACS:
- -
- DOI:
- -
- Abstract:
- The anti rutting factor G*/sin(δ), softening point, and
5 ℃ ductility of rubber asphalt were used as the evaluation indexes to explore the influence of shearing rate, rubber powder content, shear time, and shear temperature on the high and lowtemperature performance to study the effect of a polyoctene and sulfur blend on the performance of rubber asphalt. The rubber modified asphalt with different amounts (mass fraction, same below) of polyoctene（0.5%, 1.0%, and 1.5%） and sulfur （0.1% and 0.5%） were prepared using optimized process parameters. The hightemperature performance was evaluated by the softening point, dynamic shear rheology test (58 ℃), and dynamic viscosity (60 ℃). The bending beam rheometer test at different temperatures was conducted to study the lowtemperature performance. The elastic recovery and storage stability were studied by elastic recovery and segregation tests and the optimal performance of polyoctene and sulfur were recommended by comprehensive performance test results. The results show that the increase of rubber powder can improve the high and lowtemperature performance of asphalt, the increase of shear time and shear temperature have no significant effect on it, and the increase of shear rate reduces its lowtemperature performance. Therefore, the preparation process resulted in the following parameters, 20% rubber powder, a 60 min shear time, a 180 ℃ shear temperature, and a shear rate of 1 000 r/min. The addition of sulfur alone has little effect on the hightemperature performance and elastic recovery of rubber asphalt. However, modifying it with polyoctene can improve its general performance, and the higher the dosage, the more significant the performance improvement effect. Furthermore, different dosages of polyoctene and 0.1% sulfur double doping can improve the lowtemperature performance of rubber asphalt and improve its storage stability, this effect is optimal under a condition of 1.0% polyoctene. Therefore, using 0.1% sulfur and 1.0% polyoctene to prepare composite modified rubber asphalt is recommended.
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Last Update: 2020-01-17