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<p>This work developed an alternative recycling option for olive pomace to use as a bio-renewable antioxidant for asphalt binders. The bioactivities of the processed olive pomace (POP) were characterized to quantify antioxidant activities of POP, including total phenolic content, individual phenolic compounds, and 2,2’-diphenyl-1-picrylhydrazyl radical and ferric reducing antioxidant power assays. Then, this work evaluated the recycling of POP as a bio-renewable antioxidant additive to modify asphalt binders used for pavement preservation. The effectiveness of POP on the oxidation resistance of asphalt binders was assessed via both accelerated laboratory aging and natural weather aging tests. Study results showed that heating treatments of POP at 160&#xa0;°C for 2&#xa0;h or 110&#xa0;°C for 24&#xa0;h would not compromise its antioxidant activities and may even slightly increase its radical scavenging activity. The POP effectively reduced the oxidation rate of the asphalt binder during the laboratory aging test. However, its ability to delay natural weather aging on the asphalt binder is less pronounced when multiple factors, such as UV exposure and humidity, on asphalt aging come into play. The adhesion between POP-modified asphalt and aggregates before and after long-term laboratory aging was assessed using the Vialit test for the chip seal application. The POP-modified asphalt binders exhibited improved adhesion with aggregates compared with the control binder before and after the long-term laboratory aging test. Overall, POP is a promising bio-based antioxidant additive to retard asphalt aging.</p>

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Characterization of bioactivities of olive pomace as bio-renewable antioxidant for asphalt binder

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Kun Zhang,
  • Selina C. Wang,
  • Jinsong Zhang

摘要

This work developed an alternative recycling option for olive pomace to use as a bio-renewable antioxidant for asphalt binders. The bioactivities of the processed olive pomace (POP) were characterized to quantify antioxidant activities of POP, including total phenolic content, individual phenolic compounds, and 2,2’-diphenyl-1-picrylhydrazyl radical and ferric reducing antioxidant power assays. Then, this work evaluated the recycling of POP as a bio-renewable antioxidant additive to modify asphalt binders used for pavement preservation. The effectiveness of POP on the oxidation resistance of asphalt binders was assessed via both accelerated laboratory aging and natural weather aging tests. Study results showed that heating treatments of POP at 160 °C for 2 h or 110 °C for 24 h would not compromise its antioxidant activities and may even slightly increase its radical scavenging activity. The POP effectively reduced the oxidation rate of the asphalt binder during the laboratory aging test. However, its ability to delay natural weather aging on the asphalt binder is less pronounced when multiple factors, such as UV exposure and humidity, on asphalt aging come into play. The adhesion between POP-modified asphalt and aggregates before and after long-term laboratory aging was assessed using the Vialit test for the chip seal application. The POP-modified asphalt binders exhibited improved adhesion with aggregates compared with the control binder before and after the long-term laboratory aging test. Overall, POP is a promising bio-based antioxidant additive to retard asphalt aging.