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[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()
二次老化条件下温拌再生沥青胶结料的抗车辙和低温性能评价
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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
二次老化条件下温拌再生沥青胶结料的抗车辙和低温性能评价
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
李强1;  2;  孙光旭1;  罗桑3;  周洲3;  孟元鹏1
1南京林业大学土木工程学院, 南京 210037; 2南京林业大学机电产品包装生物质材料国家地方联合工程研究中心, 南京 210037; 3东南大学交通学院, 南京 211189
Keywords:
pavement engineering;  warm-mix recycled asphalt binder;  low-temperature cracking;  rutting;  secondary aging;  Fourier transform infrared spectroscopy
道路工程;  温拌再生沥青胶结料;  低温裂缝;  车辙;  二次老化;  傅立叶变换红外光谱
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.
分别采用动态剪切流变试验和弯曲梁流变试验对二次老化条件下温拌再生沥青胶结料的抗车辙和低温性能进行测试, 评价温拌技术和改性剂类型对其影响, 通过傅立叶变换红外光谱试验揭示其老化和改性机理.研究表明:温拌再生沥青胶结料二次老化后高温稳定性提高, 低温抗裂性降低.2种温拌技术表现出不同的作用.由于在不同温度下其物理形态会发生变化, 使用Sasobit温拌剂可以显著改善再生沥青胶结料的高温性能, 其车辙因子提高了4.6~5.6倍, 但是对其低温性能会带来不利的影响.使用Evotherm温拌剂则会在再生沥青胶结料结构中起到润滑作用, 从而造成其抗车辙性能下降, 其车辙因子降低了52%~62%.推荐在温拌再生沥青胶结料中掺加丁苯橡胶乳液或者胶粉以同时改善其抗车辙和低温性能.

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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.
Last Update: 2020-03-20