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Thermaloxygen aging effects on viscoelastic properties ofhigh viscosity modified asphalt(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2020年6期
Page:
1-11
Research Field:
道路工程
Publishing date:

Info

Title:
Thermaloxygen aging effects on viscoelastic properties ofhigh viscosity modified asphalt
Author(s):
YUAN Dongdong1;  JIANG Wei1; 2;  XIAO Jingjing3;  LU Hao3;  WU Wangjie1
(1. School of Highway， Changan University， Xian 710064， Shaanxi， China; 2. Key Laboratory for SpecialArea Highway Engineering of Ministry of Education， Changan University， Xian 710064， Shaanxi， China；3. School of Civil Engineering， Changan University， Xian 710061， Shaanxi， China)
Keywords:
road engineering;  high viscosity modified asphalt;  aging;  high temperature;  low temperature;  medium temperature
PACS:
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DOI:
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Abstract:
To study the thermaloxygen aging effects on viscoelastic properties of high viscosity modified asphalt, two high viscosity modifiers were selected to prepare high viscosity modified asphalt in the laboratory. The rolling thin film oven test and the pressurized aging vessel test were selected to simulate the short[KG*8]and longterm aging of two kinds of high viscosity modified asphalt, respectively. Then, a scanning electron microscope was used to investigate the thermaloxygen aging effects on the microstructure of high viscosity modified asphalt. Finally, the temperature sweep test, the flexural creep stiffness test, and the linear amplitude sweep test were used to study the effects of thermaloxygen aging on the high[KG*8]and lowtemperature viscoelastic properties and the mediumtemperature fatigue properties of the high viscosity modified asphalt. The results show that, the effects of longterm aging on the viscoelastic properties of high viscosity modified asphalt are greater than that of shortterm aging. In terms of microstructure, thermaloxygen aging mainly affects the properties of high viscosity modified asphalt from two aspects, the volatilization of light components, and the swelling and degradation of the highviscosity modifier. From the perspective of macroscopic performance, under hightemperature conditions, thermaloxygen aging will increase the complex shear modulus of high viscosity modified asphalt, decrease the phase angle and the hightemperature viscoelastic index Z, and increase the antirutting ability. Under lowtemperature conditions, thermal oxidative aging reduce the ratio of creep stiffness to creep rate m/S and the creep compliance derivative of high viscosity modified asphalt, indicating that the lowtemperature deformation ability of high viscosity modified asphalt become worse. At lowtemperature, the effect of temperature on the deformation capacity of high viscosity modified asphalt is much greater than that of the aging degree. The effect of thermal oxidative aging increases the yield stress of high viscosity modified asphalt at mediumtemperature, indicating that the fatigue life is reduced. 3 tabs, 7 figs, 28 refs.

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Last Update: 2020-12-17