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<p>To address the issues of uneven performance recovery, difficulty in balancing high and low-temperature properties, and poor compatibility with asphalt in existing rejuvenators, this study proposes the use of furfural extracted oil (FEO) for asphalt regeneration. However, the research results demonstrate that adding FEO to asphalt reduces its anti-aging ability. Previous studies have shown that the addition of organic bentonite (OBT) to asphalt enhances its anti-aging properties due to the layered structure of the bentonite. Therefore, this study aims to regenerate aged asphalt with FEO and OBT while simultaneously improving the anti-aging performance of the regenerated asphalt. Basic physical properties of the composite regenerated asphalt were compared using penetration, softening point, and ductility tests for three different OBTs: FHGEL-205B, HFGEL-120, and BP-183. The rheological characteristics were tested using dynamic shear rheological tests and bending beam rheological tests. Anti-aging ability was evaluated through residual penetration, softening point difference, and rheological fatigue aging index. Finally, Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) experiments were conducted to analyze the regeneration mechanism. The comparative analysis of the experimental results showed that the composite regenerated asphalt with 3% OBT FHGEL-205B and FEO exhibited the best overall performance. Its softening point was 1.7&#xa0;°C higher than that of the FEO regenerated asphalt and 1&#xa0;°C higher than the base asphalt, while its ductility was 64&#xa0;cm higher than that of the base asphalt. The experimental results also indicated that the anti-aging ability of FEO regenerated asphalt decreased by 14% compared to base asphalt, but after adding 3% OBT FHGEL-205B, the anti-aging ability of the regenerated asphalt increased by 35%. This study effectively resolves the issues associated with traditional rejuvenators, avoiding the weakening of high-temperature deformation resistance when improving low-temperature crack resistance. It overcomes the adverse effects of single FEO on the anti-aging performance of regenerated asphalt. Additionally, the study delves into the regeneration mechanism and anti-aging mechanisms based on chemical property changes, laying a theoretical foundation for future research.</p>

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The Rheological Properties, Micro-mechanism and Anti-aging Performance of Furfural Extract Oil and Organic Bentonite Composite Recycled Asphalt

  • 期刊论文

  • 发表日期：

    2026年2月22日

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  • Wenxue Luan,
  • Wenting Dai

摘要

To address the issues of uneven performance recovery, difficulty in balancing high and low-temperature properties, and poor compatibility with asphalt in existing rejuvenators, this study proposes the use of furfural extracted oil (FEO) for asphalt regeneration. However, the research results demonstrate that adding FEO to asphalt reduces its anti-aging ability. Previous studies have shown that the addition of organic bentonite (OBT) to asphalt enhances its anti-aging properties due to the layered structure of the bentonite. Therefore, this study aims to regenerate aged asphalt with FEO and OBT while simultaneously improving the anti-aging performance of the regenerated asphalt. Basic physical properties of the composite regenerated asphalt were compared using penetration, softening point, and ductility tests for three different OBTs: FHGEL-205B, HFGEL-120, and BP-183. The rheological characteristics were tested using dynamic shear rheological tests and bending beam rheological tests. Anti-aging ability was evaluated through residual penetration, softening point difference, and rheological fatigue aging index. Finally, Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) experiments were conducted to analyze the regeneration mechanism. The comparative analysis of the experimental results showed that the composite regenerated asphalt with 3% OBT FHGEL-205B and FEO exhibited the best overall performance. Its softening point was 1.7 °C higher than that of the FEO regenerated asphalt and 1 °C higher than the base asphalt, while its ductility was 64 cm higher than that of the base asphalt. The experimental results also indicated that the anti-aging ability of FEO regenerated asphalt decreased by 14% compared to base asphalt, but after adding 3% OBT FHGEL-205B, the anti-aging ability of the regenerated asphalt increased by 35%. This study effectively resolves the issues associated with traditional rejuvenators, avoiding the weakening of high-temperature deformation resistance when improving low-temperature crack resistance. It overcomes the adverse effects of single FEO on the anti-aging performance of regenerated asphalt. Additionally, the study delves into the regeneration mechanism and anti-aging mechanisms based on chemical property changes, laying a theoretical foundation for future research.