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Abstract:
Mineral aggregate is a significant constituent of any given asphalt mixture, and the aging performance of the binder is affected by the adsorption characteristics of the binder onto the mineral aggregate surface. In this study, the minerals commonly found in aggregates (CaO, MgO, Fe2O3, Al2O3 and SiO2) were used as representative model compounds. The residual-free asphalt binder after adsorption on different mineral types was obtained using a novel mineral adsorption column technique developed for this study. The macro- and micro-properties of the residual asphalt binders before and after aging were compared, and the effect of different types of mineral adsorption on the aging of the asphalt binder was explored. The polar fractions-based composition of the residual free asphalt binder was utilised to better understand the mechanisms of asphalt binder adsorption by minerals. The results showed that the effect of binder adsorption on different types of minerals on binder aging performance varies with the mineral type. Due to the selective adsorption of different minerals, the polarity transformation of asphalt binder components accelerated and also affected the binder aging.
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INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
ISSN: 1029-8436
Year: 2025
Issue: 1
Volume: 26
3 . 8 0 0
JCR@2022
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ESI Highly Cited Papers on the List: 0 Unfold All
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Chinese Cited Count:
30 Days PV: 14
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