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Impact of Ultraviolet Radiation on the Aging Properties of SBS-Modified Asphalt Binders

1
National Engineering Laboratory for Highway Maintenance Technology, School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China
2
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China
3
Guizhou Transportation Planning Survey & Design Academe Co., Ltd., Guizhou 550000, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(7), 1111; https://doi.org/10.3390/polym11071111
Received: 3 June 2019 / Revised: 19 June 2019 / Accepted: 20 June 2019 / Published: 1 July 2019
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Abstract

Styrene Butadiene Styrene (SBS) polymer-modified asphalt binders have become widely used in asphalt pavement because of their advantages in high- and low-temperature performance and fatigue resistance. Asphalt pavement is inevitably exposed to sunlight and ultraviolet (UV) radiation during its construction and service life. However, consideration of the aging effect of UV radiation is still limited in current pavement design and evaluation systems. In order to evaluate the impact of UV radiation on the aging properties of SBS-modified asphalt binders, UV aging tests were performed on Rolling Thin Film Oven Test (RTFOT)-aged samples with different UV radiation intensities and aging times. Sixteen different groups of tests were conducted to compare the rheological properties and functional group characteristics of SBS-modified asphalt binders. Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR), FTIR, and SEM tests were conducted to evaluate the aging mechanisms in various UV aging conditions. The results found that UV radiation seriously destroys the network structure formed by the cross-linking effect in SBS-modified asphalt binders, which aggravates the degradation of SBS and results in a great change of rheological properties after UV aging. The nature of SBS-modified asphalt binder aging resulted from the degradation of SBS and the changes of asphalt binder base composition, which lead to the transformation of colloidal structure and the deterioration of asphalt binder performance. The tests also found that continuous UV radiation can increase shrinkage stress in the asphalt binder surface and leads to surface cracking of the asphalt binder. View Full-Text
Keywords: SBS-modified asphalt binder; UV aging; rheological properties; functional group; cracking SBS-modified asphalt binder; UV aging; rheological properties; functional group; cracking
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Yu, H.; Bai, X.; Qian, G.; Wei, H.; Gong, X.; Jin, J.; Li, Z. Impact of Ultraviolet Radiation on the Aging Properties of SBS-Modified Asphalt Binders. Polymers 2019, 11, 1111.

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