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<p>The massive generation of spent coffee grounds (SCG) poses a substantial waste management challenge. Transforming this biomass waste into value-added biochar represents a promising strategy for promoting a circular economy. This study developed a method to convert SCG into coffee grounds biochar (CGB) via pyrolysis and systematically evaluated its performance as a sustainable asphalt modifier. CGB produced at 550&#xa0;°C was incorporated into asphalt, with the optimal preparation parameters determined as 2 wt% CGB dosage, 160&#xa0;°C preparation temperature, and 50&#xa0;min shearing time through orthogonal experimental design. The modified asphalt was characterized by physical tests, rheological analysis, aging tests, and microstructural techniques including scanning electron microscopy (SEM), fluorescence microscopy (FM), Fourier-transform infrared spectroscopy (FTIR), and low-field nuclear magnetic resonance (LF-NMR). Results demonstrated that incorporating 2 wt% CGB significantly enhanced the high-temperature performance of asphalt, increasing the softening point by 22.8% and the rutting factor by 140.3%, while also improving aging resistance. Microstructural analysis revealed that the porous, sheet-like structure of CGB physically adsorbed light components and formed a reinforcing network within the asphalt matrix. This study confirms the effectiveness of CGB as a sustainable asphalt modifier and establishes a feasible pathway for the high-value utilization of biomass waste in sustainable infrastructure materials.</p>

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Valorization of Spent Coffee Grounds into Biochar: A Sustainable Modifier for Enhancing Asphalt Performance

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Haibin Li,
  • Yao Tang,
  • Lianfu Liu,
  • Ping Guo,
  • Fayong Yang,
  • Yucheng Hu

摘要

The massive generation of spent coffee grounds (SCG) poses a substantial waste management challenge. Transforming this biomass waste into value-added biochar represents a promising strategy for promoting a circular economy. This study developed a method to convert SCG into coffee grounds biochar (CGB) via pyrolysis and systematically evaluated its performance as a sustainable asphalt modifier. CGB produced at 550 °C was incorporated into asphalt, with the optimal preparation parameters determined as 2 wt% CGB dosage, 160 °C preparation temperature, and 50 min shearing time through orthogonal experimental design. The modified asphalt was characterized by physical tests, rheological analysis, aging tests, and microstructural techniques including scanning electron microscopy (SEM), fluorescence microscopy (FM), Fourier-transform infrared spectroscopy (FTIR), and low-field nuclear magnetic resonance (LF-NMR). Results demonstrated that incorporating 2 wt% CGB significantly enhanced the high-temperature performance of asphalt, increasing the softening point by 22.8% and the rutting factor by 140.3%, while also improving aging resistance. Microstructural analysis revealed that the porous, sheet-like structure of CGB physically adsorbed light components and formed a reinforcing network within the asphalt matrix. This study confirms the effectiveness of CGB as a sustainable asphalt modifier and establishes a feasible pathway for the high-value utilization of biomass waste in sustainable infrastructure materials.