生物油再生老化沥青材料研究进展

Advances in Bio-oil Regenerated Aged Asphalt Materials

生物油是一种绿色、环保、可再生资源,具有恢复老化沥青物理、流变性能,改善再生沥青混合料路用性能的潜力。为了推动生物油在老化沥青材料再生领域的深入研究,概述了生物油的来源、制备及物化性能,探讨了生物油对老化沥青的再生机制,综述了生物油再生沥青和生物油再生沥青混合料的性能,围绕生物油再生老化沥青材料现有研究存在的不足,阐述了后续的研究方向。研究现状表明,压榨油类生物油在老化沥青材料再生中的应用研究较为系统,其次是富木质纤维植物基生物油,动物粪便类生物油的应用研究相对最少,但这3种类型生物油在老化沥青材料再生中均具有广阔的应用前景。富木质纤维植物基和压榨油类生物油在老化沥青再生中既发挥“稀释”作用,也体现出“溶解”作用,从化学平衡和分子结构修复2个层面实现老化沥青的再生;动物粪便类生物油在老化沥青再生中主要发挥“溶解”作用,通过其富含的极性酰胺基团化合物促进了沥青质聚集体的解缔,从分子结构修复层面实现老化沥青的再生。此外,富木质纤维植物基和压榨油类生物油可直接用于老化沥青再生,而动物粪便类生物油更适合与富油再生剂复配应用,由此才能充分发挥再生作用。在这些生物油中,压榨油类生物油体现出更好的再生老化沥青材料的效率。未来的研究应从以下几个方面进行:建立生物油来源、制备工艺与其物化性能的关联性,以便更好地甄别和评估不同来源和制备工艺的生物油作为沥青再生剂的适用性;进一步探索富木质纤维植物基、动物粪便类生物油在老化沥青材料再生中的应用潜力;重点关注生物油再生沥青和再生沥青混合料的二次老化问题;探索生物油在老化沥青材料再生领域的复配应用。

Bio-oil is a green,environmentally friendly,and renewable resource with the potential to restore the physical and rheological properties of aged asphalt and improve road performance of recycled asphalt mixtures.To promote the in-depth research of bio-oil in the field of regeneration of aged asphalt materials,the source,preparation,and physicochemical properties of bio-oil were summarized,the regeneration mechanism of bio-oil on aged asphalt was discussed,the properties of bio-oil regenerated asphalt and bio-oil regenerated asphalt mixture were reviewed,and subsequent research interests were elaborated with regard to the existing deficiencies of bio-oil regenerated aged asphalt materials.The current research shows that pressed oil bio-oil has been most systematically studied for application in the regeneration of aged asphalt materials,followed by rich wood fiber plant-based bio-oil and animal manure bio-oil.However,all three types of bio-oil have broad application prospects in the regeneration of aged asphalt materials.The rich wood fiber plant-based bio-oil and pressed oil bio-oil play the role of“diluting”and“dissolving”in the regeneration of aged asphalt,which can regenerate aged asphalt in terms of both chemical balance and molecular structure repair.The animal manure bio-oil plays the role of“dissolving”in the regeneration of aged asphalt,which achieves the regeneration of aged asphalt in terms of molecular structure repair by promoting the disintegration of asphaltene aggregates through its rich polar amide-based compounds.In addition,the rich wood fiber plant-based bio-oil and pressed oil bio-oil can be directly used for the regeneration of aged asphalt,while the animal manure bio-oil needs to be applied in combination with oil-rich regenerators to give full play to its regenerative effect.Among these bio-oils,the pressed oil bio-oil demonstrates better efficiency in regenerating aged asphalt materials.Future research is expected to be conducted as follows:establishing the correlation between the source,preparation process,and physicochemical properties of bio-oils to better screen and evaluate the applicability of bio-oils from different sources and preparation processes as asphalt regenerators;further exploring the application potential of rich wood fiber plant-based bio-oil and animal manure bio-oil in the regeneration of aged asphalt materials;focusing on the secondary aging of bio-oil regenerated asphalt and regenerated asphalt mixtures;and exploring the composite application of bio-oil in the field of regeneration of aged asphalt materials.