LOW CARBON AND ECOLOGICAL PAVEMENT MATERIALS |
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Influence and Mechanism of Aging on the Rheological Properties of Recycled Asphalt Binders with Waste Engine Oil |
LIU Fang1, WANG Qi1, ZHANG Xiao1,*, PENG Yijun2, LIU Xiaodong3
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1 School of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2 Shuoshen of Shanxi Expressway Group Co., Ltd., Shuozhou 038500, Shanxi, China 3 Shuozhou Branch of Shanxi Provincial Highway Bureau, Shuozhou 036899, Shanxi, China |
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Abstract Asphalt recycling technology is widely applied in pavement engineering because of its advantages of reducing environmental pollution, saving resources and improving cost-effectiveness. Many studies focus on whether recycled asphalt can restore its initial performance, but pays less attention to the change of performance of recycled asphalt in the re-aging process. In this work, the thermal oxygen aging tests were carried out for the original asphalt, aged asphalt and waste engine oil recycled asphalt at different aging durations respectively. Then the rheological pro-perties, low-temperature crack resistance and chemical functional groups of the three kinds of asphalt at different aging times were compared and analyzed based on the frequency sweep test and Fourier infrared spectroscopy test, and the relationship between the variation of the perfor-mances and that of chemical functionas was investigated. It was found that the rheological property of recycled asphalt was similar to the original asphalt in the reaging process. The rheological property and cracking resistance of these two kinds of asphalt decreased faster in the earlier aging stage and slower in the later stage, and the decrease range of recycled asphalt was greater than the original asphalt. At the initial stage of aging, the difference of cracking resistance between recycled asphalt and original asphalt was small. With the increase of the aging time, the difference between the two kinds of asphalt increased, and the cracking resistance of recycled asphalt was close to the aged asphalt gradually. The rheolo-gical property and cracking resistance of aged asphalt decreased slowly all the aging time; the carbonyl index of the recycled asphalt and original asphalt increased rapidly at first and then slowly with the increase of aging time, but the differences of carbonyl index between the two kinds of asphalt increased with the increase of aging time. And the carbonyl index of the aged asphalt increased approximately linearly with the increase of aging time. There were good correlations between G-R constant and carbonyl index of these three kinds of asphalt at different aging time, but the correlations were asphalt types dependent. The correlations were also different at different aging conditions. The results show that after the volatilization and oxidation of the regenerant of recycled asphalt during the re-aging process, the aging degree of recycled asphalt was gra-dually close to the aged asphalt, and the advantages of rheological properties and cracking resistance of recycled asphalt were no longer reflected.
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Published: 25 August 2022
Online: 2022-08-29
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Fund:Research Project Supported by Shanxi Scholarship Council of China(2022-066, HGKY2019031),Program for the Innovative Talents of Higher Education Institutions of Shanxi, and Science and Technology Project of Shanxi Provincial Department of Transportation(2020-1-6, 2022-02-01). |
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