Abstract
In this study, phase‐change asphalt was prepared with polyethylene glycol (PEG‐1000) as a modifier. The short‐ and long‐term antiaging performances were characterized by rolling‐thin‐film‐oven (RTFOT) and pressure‐aging vessel (PAV) tests, respectively. The functional groups and “bee structures” of PEG‐modified asphalt and base asphalt were characterized by Fourier transform infrared absorption spectroscopy (FTIR) and atomic force microscopy (AFM). The research results indicate that the additive of PEG can improve the high‐temperature, temperature sensitivity, and the antiaging properties of asphalt. The FTIR reveals that only physical blending and no chemical reaction occurs between PEG and asphalt. AFM topography indicates that smaller “bee structures” appear on the surface of PEG‐modified asphalt and these structures do not change during aging.
Highlights
Asphaltic pavement has been widely applied as its excellent performance such as smooth surface, low vibration noise, comfortable driving, and low cost in highway construction [1]
The Polyethylene glycol (PEG)-modified asphalt binder was prepared to evaluate the effect of PEG on asphalt performance. e results show that PEG can improve the high temperature properties of asphalt, and as manifested by the softening point and viscosity being improved. e PEG changes from solid to liquid at the high temperature during the reparation of phase change modified asphalt
14.9 14.0 12.5 content, the temperature sensitivity of PEG-modified asphalt decreased gradually, which shows by the PI of PEGmodified asphalt increasing gradually. e heat absorption and temperature sensitivity of asphalt decreased effectively with the increase of PEG content
Summary
Asphaltic pavement has been widely applied as its excellent performance such as smooth surface, low vibration noise, comfortable driving, and low cost in highway construction [1]. Asphalt will be softened when the environmental temperatures are extremely high. Asphalt pavement belongs to the black road surface, which is easy to absorb solar radiation heat. Series of hightemperature problems such as rutting, upheaval, aging, and fatigue can appear because of the sun’s radiation or overheat. The urban road system is covered with the urban fabric, which impedes road radiation and heat diffusion known as “urban heat island effect” [2]. In order to relief this “heat-island effect,” one of the effective measures is to lower the asphalt pavement temperature
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