Journal
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
Volume 34, Issue 10, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)MT.1943-5533.0004430
Keywords
Waste polyethylene (WPE) modified asphalt; Asphalt oxidative aging; Molecular dynamics; Glass transition temperature
Categories
Funding
- National Natural Science Foundation of China [52108425]
- China University of Geosciences (Wuhan) [CUGL150412, G1323531606, G1323519261]
- National College Student Innovation and Entrepreneurship Training Program [S202010491065]
- Shandong Highway and Bridge Maintenance Co., Ltd. [2021056502]
- Anhui Road and Bridge Engineering Group Co., Ltd. [2021056235]
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This study investigates the effect of waste polyethylene (WPE) on the performance of asphalt. Using molecular dynamics method, it is found that WPE reduces viscosity change, cohesive energy density, and improves the viscoelasticity and self-healing ability of asphalt during oxidative aging.
Waste polyethylene (WPE) is a common waste that easily pollutes the environment. WPE has been used as a modifier to improve the high-temperature stability of asphalt. However, the performance change of WPE modified asphalt during oxidative aging is still unknown. The purpose of this article is to study the effect of WPE on the performance of asphalt before and after oxidative aging by using the molecular dynamics method. First, the density, viscosity, glass transition temperature, and cohesive energy density (CED) of WPE modified asphalt before and after oxidative aging were calculated. WPE reduces the viscosity change of asphalt during oxidative aging. WPE reduces the CED value of asphalt, thereby weakening the force between asphalt molecules. In addition, the glass transition temperature indicates that WPE can alleviate the effect of oxidative aging on the reduction of the viscoelastic properties of asphalt. The viscoelasticity of 4wt% WPE modified asphalt remains almost unchanged before and after oxidative aging. In addition, WPE molecules can improve the self-healing ability of asphalt during oxidative aging.
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