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This study aims to analyze the effect of polyurethane (PU) on the high- and low-temperature performance of graphene oxide (GO)-modified asphalt. Using the three major-indices tests, bending beam rheometer (BBR) test and dynamic shear rheometer (DSR) test, the results show that composite modified asphalt improved each performance by 10% to 140% compared to the base asphalt. The change in functional groups of the composite-modified asphalt is detected by infrared spectrum scanning to analyze the modification mechanism. The asphalt preference system is established using analytic hierarchy process (AHP) in the cold region of northeastern China and the SA index is creatively added to the system to make the analysis results more accurate, resulting in 0.5% GO/4% PU being determined as the best content. This study overcomes the limitation that GO-modified asphalt cannot be used in cold areas due to its low-temperature performance, and it can be widely used as a new composite material with its high performance.

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Effect of Polyurethane on High- and Low-Temperature Performance of Graphene Oxide-Modified Asphalt and Analysis of the Mechanism Based on Infrared Spectrum