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Aging Mechanism and Properties of SBS Modified Bitumen under Complex Environmental Conditions

1
State Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha 410114, Hunan, China
2
School of Civil Engineering, Central South University, Changsha 410083, Hunan, China
3
Department of Municipal Design, Zhonglugang Engineering Conultants, Beijing 100029, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(7), 1189; https://doi.org/10.3390/ma12071189
Received: 13 March 2019 / Revised: 28 March 2019 / Accepted: 5 April 2019 / Published: 11 April 2019
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Abstract

Bitumen aging can lead to the deterioration of asphalt pavement performance, shortening the service life of road. In order to solve the problem that current studies on the ultraviolet (UV) aging of bitumen either ignore the effects of natural environmental conditions or only consider the effects of water. In this study, different aqueous media and UV coupled simulated aging tests were carried out on virgin bitumen and styrene butadiene styrene (SBS) modified bitumen in a UV environment chamber. The combination of macroscopic performance tests and microstructure tests was used to analyze the physical, rheological, and microstructure changes of virgin bitumen and SBS modified bitumen after The film oven test (TFOT) aging and UV aging in different environments (UV, UV + Water, UV + Acid, UV + Salt). Dynamic shear rheometer (DSR) results indicated that UV aging results in the increase of rutting factor and the improvement of rutting resistance at high temperature. The Fourier transform infrared spectrum (FTIR) results illustrated that the bitumen would be oxidized and SBS would be degraded under ultraviolet radiation. The four-component analysis test results showed that light component migrated to the heavy component during the aging process. Moreover, water will aggravate the UV aging of bitumen, and the presence of acid or salt worsens ultraviolet aging. View Full-Text
Keywords: SBS modified bitumen; ultraviolet aging; physical properties; rheological properties; microstructure SBS modified bitumen; ultraviolet aging; physical properties; rheological properties; microstructure
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Wei, H.; Bai, X.; Qian, G.; Wang, F.; Li, Z.; Jin, J.; Zhang, Y. Aging Mechanism and Properties of SBS Modified Bitumen under Complex Environmental Conditions. Materials 2019, 12, 1189.

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