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Lowtemperature performance and its evaluation methods of finished product rubber asphalt mixture in alpine region(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2019年06期
Page:
31-38
Research Field:
道路工程
Publishing date:

Info

Title:
Lowtemperature performance and its evaluation methods of finished product rubber asphalt mixture in alpine region
Author(s):
LIU Zhanliang;  ZHANG Chen;  XU Jinliang
(1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Department of Railway Engineering, Shijiazhuang Institute of Railway Technology, Shijiazhuang 050041, Hebei, China; 3. School of Energy and Architecture, Xi’an Aeronautical University, Xi’an 710077, Shaanxi, China)
Keywords:
road engineering;  alpine region;  finished product rubber asphalt mixture;  lowtemperature performance;  evaluation method
PACS:
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DOI:
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Abstract:
To study the evaluation methods and lowtemperature performance of a RA1 finished product rubber asphalt mixture in an alpine region, a test along the south section of the SichuanTibet Highway was selected as the support construction. The strength, aging and freezethaw cycle effect of the asphalt mixture through laboratory tests such as the beam bending, splitting, aging, and freezethaw cycle tests were used to analyze the low temperature performance of a the RA1 rubber asphalt mixture and provide a reasonable performance evaluation standard at low temperature. The results show that when the temperature is from -5 ℃ to 0 ℃, the maximum bending strain of the RA1 rubber asphalt mixture show a greater increase of approximately 34.4%. When the loading rate is 2 mm/min, the splitting test can reflect the damage process of the mixture at low temperature. With an increase in temperature, the maximum bending strain and cleavage strength of the mixture following shortterm aging are greater than that after longterm aging. After approximately 20 freezethaw cycles, the splitting tensile strength of the mixture attenuation trend gradually stabilizes. After 40 freezethaw cycles, the maximum bending strain of the mixture decreases by 13.9%, compared to that of the initial state. A splitting test is suitable to evaluate low temperature performance for the new mixture, and the loading rate is appropriate for an adjustment of 2 mm/min. A lowtemperature bending test is suitable to evaluate lowtemperature performance of the mixture after longterm aging, and the loading rate is appropriate for an adjustment of 15 mm/min. A freezethaw splitting test is suitable to evaluate the lowtemperature performance for the mixture with freezethaw action and the loading rate is appropriate for an adjustment of 2 mm/min. The RA1 finished rubber asphalt mixture is suitable for road surfaces in the Sichuan alpine region. 4 tabs, 8 figs, 24 refs.

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Last Update: 2019-12-19