To address the poor chemical stability of organic anti-aging agents in asphalt binder and the incompatibility of inorganic ones, this study developed a novel anti-aging agent IZrP (IPPD- intercalated zirconium phosphate) by intercalating the hindered amine antioxidant IPPD into zirconium phosphate (ZrP). The effects of ZrP, IZrP, IPPD and the conventional antioxidant pentaerythritol tetrakis 3-(3',5'-di-tert-butyl-4'-hydroxyphenyl) propionate (BHPM) on the physical, rheological and anti-aging properties of asphalt binder were systematically studied. Results demonstrates that IPPD organic intercalation expands ZrP interlayer spacing from 0.76 to 1.87 nm, significantly enhancing hydrophobicity. Thermogravimetric analysis reveals increased decomposition temperatures for intercalated IPPD, confirming ZrP’s protective role in improving thermal stability. IZrP improves the low-temperature, fatigue, and storage stability of asphalt binder compared to ZrP. In thermal-oxidative aging tests, ZrP and IZrP exhibit superior performance in enhancing the aging resistance of asphalt binder compared to organic agents (BHPM, IPPD), maintaining stable long-term performance. And IZrP demonstrates the best performance, extending the asphalt binder's service life by 38.8%. These findings establish a novel strategy for developing high-efficacy, high-stability asphalt binder anti-aging agents, advancing the development of long-life asphalt pavements.
Cao et al. (Fri,) studied this question.