Comparative Study on the Laboratory and Field Aging Behavior of Asphalt Binders in High-altitude Regions
The unique climate of China's high-altitude regions,marked by significant daily temperature variations and intense ultraviolet radiation,accelerates the aging process of asphalt,thereby influencing the longevity of road surfaces.This study,grounded in the actual on-site climate conditions,sets the parameters for a laboratory environment simulation box designed for accelerated aging.Here,both matrix asphalt and SBS modified asphalt undergo accelerated ultraviolet(UV)aging.The changes in the performance of these materials throughout the aging process are quantitatively characterized using infrared spectroscopy analysis,conventional physical property testing,and rheological tests.The results reveal that:1)The laboratory accelerated ultraviolet aging test can effectively simulate the long-term performance changes of asphalt under natural aging conditions on-site,where the trends in changes of microscopic,physical,and rheological indicators(such as carbonyl index,sulfoxide index,penetration,softening point,shear modulus G∗,and phase angle δ,etc.)are similar to those observed in natural aging on-site;2)Compared to the 90#matrix asphalt,SBS modified asphalt showed better anti-aging performance;the 90#matrix asphalt reached the effect of 6 months of natural aging after only 6 days of laboratory accelerated ultraviolet aging,whereas the SBS modified asphalt required 12 days.However,there is a discrepancy between the accelerated UV aging indicators in the lab determined through radiation equivalent conversion and the actual field aging indicators;3)The factor control of the laboratory accelerated simulation aging method is more stable than the on-site environment,resulting in differences in the on-site aging rate compared to the equivalent converted laboratory aging rate;4)Selecting appropriate aging indicators is important for accurately assessing the degree of asphalt aging and predicting its long-term performance.This research lays data foundation for establishing a relationship between laboratory simulations and the field service of asphalt aging,providing valuable parameter references and technical support for the design of durable asphalt pavement methods in high-altitude regions.
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