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<p>This study investigates the potential of producing geopolymer-modified asphalt binders (GMA) using waste-based materials to create cleaner, more sustainable binders. Geopolymers were synthesized from fly ash and metakaolin-silica fume (MK-SF) and used to modify asphalt binders at varying proportions (4%, 8%, and 12%). Rheological, chemical, and microstructural analyses were conducted to evaluate the performance of these modified binders. The results indicated that GMA, especially with 12% fly ash and 4% MK-SF, significantly improved the high-temperature performance, with rutting resistance increasing by up to 43% for 12% fly ash and 30% for 4% MK-SF. The 12% fly ash GMA also exhibited a 20% enhancement in thermal cracking resistance. The curing time of geopolymers within the binder significantly influenced the aging and thermal cracking resistance, with prolonged curing enhancing these properties. The findings demonstrate the feasibility of integrating geopolymers into asphalt binders, providing an eco-friendly alternative while addressing industrial waste disposal issues.</p>

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A Cleaner Production of Asphalt Binders Incorporating FA and MK-SF Geopolymers

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Amani Saleh,
  • Maram Saudy,
  • Mohamed Nagib AbouZeid

摘要

This study investigates the potential of producing geopolymer-modified asphalt binders (GMA) using waste-based materials to create cleaner, more sustainable binders. Geopolymers were synthesized from fly ash and metakaolin-silica fume (MK-SF) and used to modify asphalt binders at varying proportions (4%, 8%, and 12%). Rheological, chemical, and microstructural analyses were conducted to evaluate the performance of these modified binders. The results indicated that GMA, especially with 12% fly ash and 4% MK-SF, significantly improved the high-temperature performance, with rutting resistance increasing by up to 43% for 12% fly ash and 30% for 4% MK-SF. The 12% fly ash GMA also exhibited a 20% enhancement in thermal cracking resistance. The curing time of geopolymers within the binder significantly influenced the aging and thermal cracking resistance, with prolonged curing enhancing these properties. The findings demonstrate the feasibility of integrating geopolymers into asphalt binders, providing an eco-friendly alternative while addressing industrial waste disposal issues.