Evaluation method of asphalt and aggregate adhesion durability(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2018年05期
- Page:
- 32-39
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Evaluation method of asphalt and aggregate adhesion durability
- Author(s):
- LI Shanqiang1; 2; YE Hongyu1; FANG Yang2; LI Hao2
- (1. School of Highway, Changan University, Xian 710064, Shaanxi, China;2. Guangdong Hualu Transport Technology Co., Ltd., Guangzhou 510420, Guangdong, China)
- Keywords:
- road engineering; boiling method; adhesion between asphalt and aggregate; evaluation standard
- PACS:
- -
- DOI:
- -
- Abstract:
- To quantitatively evaluate the adhesion between asphalt and aggregate, a boiling test was performed，and the results were compared with the water boiling method. Five types of Aclass 70# matrix asphalt and five types of SBS modified asphalt was selected, rolling thin film oven tester（RTFOT） were adopted to simulate the shortterm aging. Pressure ageing vessel(PAV) was adopted to simulate longterm aging. The original asphalt was used as contrast, 30 samples with different aging degrees were prepared using three types of lithologic coarse aggregate. Ninety adhesive tests were conducted in total. A comprehensive evaluation method of adhesion of asphalt and aggregate based on water boiling and boiling was proposed. The results show that the adhesion grade between the matrix asphalt and aggregate increases with the increase of asphalt aging degree, for the water boiling method, and the adhesion grades between modified asphalt before and after aging with all kinds of aggregate are level 5. The water boiling method is ineffective to the modified asphalt. Boiling test results show that the rule of adhesion time is aging, shortterm aging, nonaging from large to small, the adhesion time is limestone, diorite and granite from large to small. The irregular aggregate is prepared in the form of a spherical aggregate with a diameter of 19 mm to eliminate surface shape defects. The adhesive grade of all asphalt types and aggregates is level 5 of water boiling method. Water boiling method.is unable to distinguish adhesion time,however, the boiling method can still effectively evaluate the adhesion time of asphalt and spherical aggregates. To compare between the two methods of adhesion evaluation of asphalt and aggregate，the adhesive grade is used as the evaluation index in the water boiling method, and the adhesion time is used as the evaluation index in the boiling method and the spherical aggregate is used as the standard sample. The technical requirements for the shortterm aging of matrix asphalt and the modified asphalt are proposed. 4 tabs, 7 figs, 23 refs.
Last Update: 2018-10-23