EFFECTS OF ANTIOXIDANTS AND AGING DEGREE ON THE ADHESION OF ASPHALT AND LIMESTONE INTERFACE

Abstract

Abstract: In order to explore the influence mechanism of antioxidants and aging on the adhesion of asphalt-limestone interface, the adhesion of antioxidants (Irganox 1010 and Irgafos 168) at the interface between asphalt and limestone aggregate at different aging stages was investigated by quantitatively analyzing the mass loss rate and solution absorbance of asphalt-aggregate mixtures before and after aging. Furthermore, combined with molecular dynamics simulation, the changes of adhesion work and diffusion coefficient of asphalt at the aggregate interface before and after aging were calculated. The results show that with the deepening of aging, the adhesion of asphalt on the surface of the aggregate gradually decreases and the mass loss rate increases. Antioxidants can inhibit the oxidation reaction of asphalt, and the adhesion between modified asphalt and aggregate at the same aging stage is better than that of unmodified No.70 asphalt. The addition of antioxidants can significantly improve the adhesion and diffusivity of asphalt at the aggregate interface, because oxidation enhances the polarity of asphalt, improves the fluidity of asphalt, and makes it react with highly active ions on the aggregate surface to form stable chemical bonds. The adhesion between modified asphalt and aggregate was significantly better than that of No.70 asphalt, and the modification effect of Irganox 1010 was better than that of Irgafos 168.

Key words: modified asphalt, antioxidant, adhesion properties, molecular dynamics

References

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