Study on the Aging Resistance of Polyurethane Precursor Modified Bitumen and its Mechanism

Liang Zhang, Pengfei Li, Guanfeng Hu, Sufeng Zhang, Bin Hong, Haopeng Wang, Dawei Wang and Markus Oeser
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Liang Zhang: Heilongjiang Highway Construction Center, Harbin 150040, China
Pengfei Li: Highway Engineering Cost Station of Heilongjiang Province, Harbin 150008, China
Guanfeng Hu: Heilongjiang Longjian Road bridge 5th Engineering Co., Ltd., Harbin 150077, China
Sufeng Zhang: Heilongjiang Highway Construction Center, Harbin 150040, China
Bin Hong: School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
Haopeng Wang: Section of Pavement Engineering, Faculty of Civil Engineering & Geosciences, Delft University of Technology, 2628CN Delft, The Netherlands
Dawei Wang: School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
Markus Oeser: Institute of Highway Engineering, RWTH Aachen University, 52074 Aachen, Germany

Sustainability, 2021, vol. 13, issue 17, 1-25

Abstract: As an environmentally friendly alternative for the production of high-performance modified asphalt by chemical reactions, a liquid-state polyurethane-precursor-based reactive modifier (PRM) was developed and employed in the asphalt modification. In contrast to the traditional solid bitumen modifier, for example, rubber and thermoplastic elastomers, the PRM as a liquid modifier has more significant advantages in reducing energy consumption and improving asphalt performance, which has attracted widespread attention. However, the aging resistance and its mechanism are not clear. In view of this, the aging performance of two PRM-modified bitumen (PRM-70 and PRM-90), under the short-term thermo-oxidative aging, long-term thermo-oxidative aging, and ultraviolet (UV) aging conditions, was investigated through chemical and mechanical methods. The results show that the PRM-90 is more susceptible to the thermos-oxidative aging and UV aging. The use of low-penetration-grade bitumen and ensuring an adequate reaction are beneficial to enhance the aging resistance of PRM-modified bitumen. The impact of aging on high-temperature performance of PRM-modified bitumen is great, followed by the low-temperature performance and the anti-fatigue performance. The mechanic-relevant rheological aging index ( RAI ) and fracture energy index ( FEI ) are recommended to evaluate aging properties for PRM-modified bitumen. This study not only provides support for further research on the relationship between the aging properties and mechanical performance of PRM-modified bitumen, but also provides a reference for conducting mechanism analysis.

Keywords: polyurethane precursor; modified bitumen; aging resistance; thermal-oxidation aging; ultraviolet aging (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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