生物基树脂改性沥青流变特性评价及体系融合行为

Rheological Properties Evaluation and System Fusion Behavior of Bio-based Resin Modified Asphalt Binders

受石油资源储量和供应的限制,将生物质材料引入石油沥青已经成为一个热门话题。本研究以麦草秸秆液化产物为原材料合成三种生物基树脂(BPF、BPU和BPF-PU),并将其用于生物沥青的制备,旨在探究生物基树脂对沥青流变特性的影响及二者之间的交互作用。首先,通过频率扫描和多重应力蠕变恢复试验分析了树脂对沥青胶结料黏弹特性和高温抗车辙性能的影响;其次,借助流变学理论对树脂-沥青体系的相态结构进行了分析;最后,从荧光显微结构和官能团分布特征的角度探究了二者之间的融合行为。结果表明,BPF和BPF-PU能够增加沥青中的弹性成分,提升其高温抗车辙性能,而BPU则会强化沥青的黏性响应;三种树脂能够较为均匀地分散到基质沥青中,并与其形成稳定的相态结构,这可能是因为树脂与基质沥青之间形成了醚键(C-O-C)。本研究有助于为农作物秸秆的增值转化和生物沥青的开发提供新的思路,但在生物沥青性能的全面评价方面需要进一步研究。

Limited by the reserves and supply of petroleum resources,introducing biomass materials into petroleum asphalt binders has become a hot topic.In this study,three kinds of bio-based resins(i.e.,BPF,BPU and BPF-PU)were synthesized from wheat straw liquefaction pro-ducts and used for the preparation of bio-asphalt binders.This work aims to investigate the effect of bio-based resins on the rheological properties of the neat asphalt binder and their interactions.Firstly,the effects of bio-based resins on viscoelastic properties and high-temperature rutting resistance of the asphalt binder were evaluated by the frequency scanning test and the multiple stress creep recovery test.Subsequently,the phase structure of resin-asphalt system was analyzed based on the rheological theory.Finally,the fusion behavior of resins and asphalt binders was explored by fluorescence microstructure and functional group distribution.The results indicate that the percentage elastic components in the neat asphalt binder can be increased by BPF and BPF-PU,leading to superior anti-rutting performance.However,BPU tends to enhance the viscous response of the neat asphalt binder.The resins can be dispersed into the neat asphalt binder and form a uniform and stable phase structure,which may be attributed to the formation of ether bonds(C-O-C)between the resin and the neat asphalt binder.This investigation contributes to provide new ideas for the value-added conversion of the crop straw and the development of bio-asphalt binders,while further research is needed in the comprehensive evaluation of the bio-asphalt binder performance.