Abstract
Defect-structured Zn a Mg b Al c layered double hydroxides (d-Zn a Mg b Al c -LDHs) with varying Mg/Zn ratios have been prepared by modifying the surface of Zn a Mg b Al c -LDHs through a chemical etching method. The ultraviolet (UV) blocking properties of d-Zn a Mg b Al c -LDHs were significantly improved, and d-Zn 4 Al 2 -LDH was added into asphalt to explore the potential anti–UV-aging application in asphalt. Research results show that 3 wt% of d-Zn 4 Al 2 -LDH could significantly improve the anti–UV-aging ability of asphalt, resulting from oxygen vacancy defects produced on the surface of d-Zn 4 Al 2 -LDH. Specifically, these oxygen defect vacancies can adsorb the free radicals generated during the asphalt aging process; therefore, it blocked the fragmentation of the macromolecule chain in asphalt and postponed the aging process. • The defect-structured Zn a Mg b Al c layered double hydroxides (LDHs) were prepared through a chemical etching method. • The optimal sample (3 wt% of d-Zn 4 Al 2 -LDHs) exhibits significantly improved anti–UV-aging ability for asphalt. • The reason for excellent performance is abundant oxygen vacancy defects produced on the surface of this efficient material.
Published Version
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