[1] Li Qiang, Sun Guangxu, Luo Sang, et al. Evaluation of rutting and low-temperature cracking resistancesof warm-mix recycled asphalt bindersunder the secondary aging condition [J]. Journal of Southeast University (English Edition), 2020, 36 (1): 81-87. [doi:10.3969/j.issn.1003-7985.2020.01.011]

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Evaluation of rutting and low-temperature cracking resistancesof warm-mix recycled asphalt bindersunder the secondary aging condition()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

36

Issue:

2020 1

Page:

81-87

Research Field:

Traffic and Transportation Engineering

Publishing date:

2020-03-20

Info

Title:

Evaluation of rutting and low-temperature cracking resistancesof warm-mix recycled asphalt bindersunder the secondary aging condition

Author(s):

Li Qiang¹;  2;  Sun Guangxu¹;  Luo Sang³;  Zhou Zhou³;  Meng Yuanpeng¹

¹College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
²National-Provincial Joint Engineering Research Center of Electromechanical Product Packaging, Nanjing Forestry University, Nanjing 210037, China
³School of Transportation, Southeast University, Nanjing 211189, China

Keywords:

pavement engineering;  warm-mix recycled asphalt binder;  low-temperature cracking;  rutting;  secondary aging;  Fourier transform infrared spectroscopy

PACS:

U416.21

DOI:

10.3969/j.issn.1003-7985.2020.01.011

Abstract:

The rutting and low-temperature resistances of warm-mix recycled asphalt binders under the secondary aging condition were measured by the dynamic shear rheometer test and bending beam rheometer test. Effects of different types of warm-mix asphalt(WMA)technologies and additives were evaluated. Aging and improvement mechanisms were investigated by the Fourier transform infrared spectroscopy test. It is found that recycled binders after the secondary aging are more resistant to rutting and less resistant to low-temperature cracking. The two warm-mix asphalt technologies have opposite effects. Using the Sasobit WMA significantly improves the rutting resistance and reduces the low temperature resistance for the recycled binders due to its morphological change at different temperatures. The rutting factor values of recycled asphalt binders with the Sasobit additive increase by 4.6 to 5.6 times. However, using the Evotherm WMA causes the deterioration of the rutting resistance due to the structural lubrication effect. The rutting factor values of recycled asphalt binders with the Evotherm additive show the reduction of 52% to 62%. It is recommended to add the styrene butadiene rubber latex or crumb rubber powder into the warm-mix recycled asphalt binders to simultaneously improve the rutting and low-temperature cracking resistances.

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Memo

Memo:

Biography: Li Qiang(1982—), male, doctor, associate professor, liqiang2526@njfu.edu.cn.
Foundation items: The Natural Science Foundation of Jiangsu Province(No.BK20181404), Qing Lan Project(2016), the Training Plan Project for Young Core Teachers of Nanjing Forestry University(2017).
Citation: Li Qiang, Sun Guangxu, Luo Sang, et al. Evaluation of rutting and low-temperature cracking resistances of warm-mix recycled asphalt binders under the secondary aging condition[J].Journal of Southeast University(English Edition), 2020, 36(1):81-87.DOI:10.3969/j.issn.1003-7985.2020.01.011.

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