Abstract
Due to the severe natural environment found in high-altitude and cold regions, where the altitude is around 4000 m, and the average annual temperature is below 0°C, the design method and quality indicators of asphalt mixture performance is different in comparison to inland cities. To optimize design parameters and low-temperature performance of SBS modified asphalt mixture in high-altitude and cold regions, the beam bending, splitting, aging, and freez-thaw cycle tests were conducted based on the test protocol, field experience and quantitative analysis. Standard mixing procedures and evaluation indexes for low temperature anti-cracking performance were used to reveal the low temperature decaying characteristics of SBS modified asphalt mixtures. The results show that the optimum binder-aggregate ratio of 5.3% and the optimum SBS modifier dosage of 4%∼5% are recommended for SBS modified asphalt mixture in the high altitude and cold regions of the Tibetan Plateau. The splitting test is suitable for assessing low-temperature performance of asphalt mixtures in high altitude and cold regions with a loading rate adjusted to 2 mm/min. When the loading rate is adjusted to 10 mm/min, the beam bending test is suitable for studying the low-temperature performance of asphalt mixtures after long-term aging in high altitude and cold regions. The freezing and thawing split test is suitable for assessing low-temperature performance of asphalt mixtures after freezing and thawing in high altitude and cold regions when the loading rate is adjusted to 2 mm/min. Under long-term aging conditions, as temperature increases (−15°C∼0°C), the decay rate of maximum flexural-tensile strain of traditional asphalt mixture is bigger than that of SBS modified asphalt mixture. Having endured freezing and thawing cycles, the splitting strength and the maximum flexural-tensile strain of asphalt mixtures decreases. After 40 cycles of freezing and thawing, the maximum flexural-tensile strain decreases by 15.2% in comparison to state.
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This research is supported by the Scientific Research Foundation of Xi’an Aeronautical University (2018KY0212), the research project of the National Natural Science Foundation of China (NSFC) (No. 51578075), and the Special Fund for Basic Scientific Research of Central Colleges, Chang’an University (CHD310821153503).
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Zhang, C., Wang, H. & Yang, X. Low-temperature performance of SBS modified asphalt mixture in high altitude and cold regions. Int. J. Pavement Res. Technol. 12, 33–42 (2019). https://doi.org/10.1007/s42947-019-0005-4
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DOI: https://doi.org/10.1007/s42947-019-0005-4