为开发新型生物质材料复合再生剂并探究其再生效果与作用机理,采用废食用油(WCO)与污泥基生物炭(BC)粉末共同制备复合再生剂,基于物理性能、流变性能、热性能、组分与化学特性等测试对比复合再生剂的作用效果。结果表明,WCO可有效补充老化沥青的轻质组分,提升沥青的低温性能,但会削弱沥青的高温性能;5% WCO+10% BC为复合再生剂最佳配比,BC的加入可有效改善再生沥青的高温稳定性,使性能分级温度提高超过8℃,且对低温性能影响较小,使沥青分子结构得到改善。BC可在再生沥青中产生新的官能团,并通过表面结构与孔隙特性使其与沥青更充分结合并形成更稳定的骨架结构,从而提高沥青的刚度和热稳定性。两种生物基材料的协同作用可从根本上解决单一再生剂引发的热稳定性劣化问题,为新型再生剂的研发提供技术依据。
To develop a new type of biomass material composite rejuvenator and explore its rejuvenation effect and action mechanism,waste cooking oil (WCO) and sludge-based biochar powder (BC) were used to prepare a composite rejuvenator.The effect of the composite rejuvenator was evaluated based on tests on physical properties,rheological properties,thermal properties,components,and chemical characteristics.The results showed that WCO could effectively supplement the light components of aged asphalt and improve the low-temperature performance of asphalt,but it weakened the high-temperature performance of then asphalt.The optimal ratio of the composite rejuvenator was 5% WCO + 10% BC.The addition of BC could effectively enhance the high-temperature stability of rejuvenated asphalt,increasing the performance grading temperature by more than 8℃,while having little impact on the low-temperature performance and improving the molecular structure of the asphalt.BC could generate new functional groups in the rejuvenated asphalt,and through its surface structure and pore characteristics,it could combine more fully with asphalt to form a more stable framework structure,thereby improving the stiffness and thermal stability of the asphalt.The synergistic effect of the two bio-based materials fundamentally solved the problem of thermal stability deterioration caused by a single rejuvenator,providing a technical basis for the research and development of new rejuvenators.
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基金资助
湖南省自然科学基金项目(2025JJ70647);湖南省大学生创新训练计划项目(S202510538135)
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