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<p>When used as crack repairing material, epoxy asphalt lacks the required flexibility, and styrene–butadiene–styrene (SBS) modified asphalt (SA) is prone to aging, impairing durability. To overcome these issues, an epoxy resin prepolymer (ERP) and SBS composite modified asphalt (SECA) was prepared. The properties of SECA were systematically evaluated after aging simulated by rotating film oven test (RTFOT), pressure aging vessel (PAV) and ultraviolet aging chamber methods. The optimum dosages of ERP and SBS were determined by the evolution of basic performance of SECA. The effects of polymer degradation on high-temperature rheology were investigated through temperature sweep, multiple stress creep (MSCR), and master curve modeling. Fourier transform infrared (FTIR) analysis was used to analyze the chemical changes during aging, while fluorescence microscopy (FM) revealed the distribution of ERP and SBS. Results indicate that the optimal aging resistance of SECA is achieved with 4% SBS and 30% ERP. The aging-induced deterioration of SECA is mainly due to asphalt oxidative hardening combined with polymer bond breakdown and reorganization. SECA exhibits superior aging resistance over SA, mainly because the formed interpenetrating polymer network structures (IPNs) that delays structural degradation. These findings provide a valuable reference for selecting anti-aging crack repairing materials in high temperature regions.</p>

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Rheological evaluation and oxidative mechanism of aged epoxy/styrene–butadiene–styrene composite modified asphalt for crack repairing

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Lifang Song,
  • Panpan Lei,
  • Xiaoyu Zhao,
  • Shilong Guo,
  • Huiyun Xia,
  • Dongyu Niu,
  • Sen Huang,
  • Meiqi Yang

摘要

When used as crack repairing material, epoxy asphalt lacks the required flexibility, and styrene–butadiene–styrene (SBS) modified asphalt (SA) is prone to aging, impairing durability. To overcome these issues, an epoxy resin prepolymer (ERP) and SBS composite modified asphalt (SECA) was prepared. The properties of SECA were systematically evaluated after aging simulated by rotating film oven test (RTFOT), pressure aging vessel (PAV) and ultraviolet aging chamber methods. The optimum dosages of ERP and SBS were determined by the evolution of basic performance of SECA. The effects of polymer degradation on high-temperature rheology were investigated through temperature sweep, multiple stress creep (MSCR), and master curve modeling. Fourier transform infrared (FTIR) analysis was used to analyze the chemical changes during aging, while fluorescence microscopy (FM) revealed the distribution of ERP and SBS. Results indicate that the optimal aging resistance of SECA is achieved with 4% SBS and 30% ERP. The aging-induced deterioration of SECA is mainly due to asphalt oxidative hardening combined with polymer bond breakdown and reorganization. SECA exhibits superior aging resistance over SA, mainly because the formed interpenetrating polymer network structures (IPNs) that delays structural degradation. These findings provide a valuable reference for selecting anti-aging crack repairing materials in high temperature regions.