Study on anti-aging mechanism and performance of asphalt modified with Si-Al coated TiO2-functionalized SBS
In order to better utilize the excellent UV shielding function of nano-TiO2,improve the anti-aging performance of SBS-modified asphalt,and address a difficulty in the dispersion of nano-TiO2 in the SBS-modified asphalt system,the Si-Al coated nano-TiO2 was prepared using a Si-Al coprecipitation method to form the coating film on the surface of nano-TiO2.This approach can effectively prevent the oxidation of SBS-modified asphalt caused by nano-TiO2 due to its photo-catalytic activity and thus enhance the anti-aging performance of nano-TiO2-functionalized SBS-modified asphalt.The coating effect and morphological microstructure of the coated nano-TiO2 were investigated by TEM and XRD,the ultra-violet(UV)absorption capacity of the modified asphalt was analyzed by UV spectrophotometry,the influence of Si-Al coating on the dispersion and stability of nano-TiO2 and SBS was evaluated by SEM and fluorescence microscopy,and the anti-aging mechanism of the Si-Al coated nano-TiO2 functionalized SBS-modified asphalt was analyzed by FTIR spectroscopy.Finally,the performance of the functionalized SBS-modified asphalt was studied.The results indicated that the dispersion and stability of nano-TiO2 and SBS in asphalt were effectively improved when 6 wt%Si-Al coated na-no-TiO2 was incorporated.In this case,the oxidation effect of nano-TiO2 on the modified asphalt could be suppressed,and the anti-aging performance of the SBS-modified asphalt could be improved.
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