Abstract
Reutilization of reclaimed asphalt pavement (RAP) is conducive to achieving carbon peak and neutrality goals and establishing a resources recycling system for road engineering. Previous studies have indicated that recycled asphalt mixtures with RAP content exceeding 30% seem inappeasable in upper surface of asphalt pavement due to their inferior skid resistance and endurance. While steel slag, a solid waste with excellent mechanical properties and high alkalinity, can elevate performances of asphalt mixture. Recycled asphalt mixtures involving 50%, 60% and 70% RAP content and steel slags were prepared firstly, and their road performances were characterized. Properties discrepancies existing in microstructure and geometric characteristics of steel slag and basalt and their interfacial properties with asphalt were discussed. The results indicate that incorporating steel slag in recycled asphalt mixtures with 70% RAP content reveals a desirable performances indexes in contrast to basalt. The adhesion and mechanical performance of recycled asphalt mixtures can be significantly enhanced by steel slag due to its honeycomb porous structure, larger angularity, lower sphericity and higher texture. Steel slag and recycled asphalt demonstrate lower spalling rate under hydrodynamic pressure and larger adhesive destructive force compared with basalt, resulting in superior moisture susceptibility and cracking resistance for recycled asphalt mixtures.
Published Version
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