Zhang Renwei, Wang Junfang, Kang Haixin
School of Architecture and Civil Engineering, Sanming University, Sanming, 365004, Fujian, China.
Key Laboratory of Engineering Material & Structure Reinforement in Fujian Province Colleges (Sanming University), Sanming, 365004, China.
Sci Rep. 2024 Jun 18;14(1):14072. doi: 10.1038/s41598-024-64816-9.
The balance between the low and high temperature performance of asphalt materials is important to avoid either rutting deformation or low temperature cracking resistance of asphalt pavement. This is beneficial for improving the asphalt pavement comprehensive performance. Considering the excellent high temperature performance of Ethylene-vinyl acetate (EVA) modified asphalt, this study first modified it with Waste Biological Oil (WBO) to prepare WBO/EVA composite modified asphalt (WEMA) with different dosages. Then the samples were evaluated by the traditional physical properties, low and high temperature rheological properties. Finally, the micro mechanism of WBO on EVA modified asphalt were explored by gel permeation chromatography (GPC) test and atomic force microscope (AFM) experiments. The experimental results reveal that WBO has a softening effect on EVA modified asphalt, reducing its stiffness and improving its stretching performance and flowability. In addition, WBO can reduce the high-temperature deformation resistance of EMA modified asphalt, but it significantly enhances the low-temperature property of EVA modified asphalt. When the WBO content ranges from 1.5 to 2.5%, the high-temperature performance of WEMA is inferior to that of EVA-modified asphalt, however, its low-temperature performance is significantly better than that of EVA-modified asphalt. Importantly, within this WBO content range, the comprehensive performance of WEMA is superior to that of pure asphalt. Mechanism investigation showed that WBO reduces the content of macromolecular micelles and average molecular weight in EVA modified asphalt, and it also diluts the asphaltene components in the asphalt system, resulting in a slight weakening of the performance of WEMA at high temperatures and a significant performance enhancement at low temperatures. Ultimately, the utilization of WBO/EVA composite modified asphalt has a better comprehensive performance.
沥青材料的低温和高温性能之间的平衡对于避免沥青路面出现车辙变形或低温抗裂性至关重要。这有利于提高沥青路面的综合性能。考虑到乙烯 - 醋酸乙烯酯（EVA）改性沥青具有优异的高温性能，本研究首先用废弃生物油（WBO）对其进行改性，制备了不同剂量的WBO/EVA复合改性沥青（WEMA）。然后通过传统物理性能、低温和高温流变性能对样品进行评估。最后，通过凝胶渗透色谱（GPC）测试和原子力显微镜（AFM）实验探索了WBO对EVA改性沥青的微观作用机理。实验结果表明，WBO对EVA改性沥青具有软化作用，降低了其刚度，提高了其拉伸性能和流动性。此外，WBO可以降低EMA改性沥青的高温抗变形能力，但显著提高了EVA改性沥青的低温性能。当WBO含量在1.5%至2.5%之间时，WEMA的高温性能低于EVA改性沥青，但其低温性能明显优于EVA改性沥青。重要的是，在此WBO含量范围内，WEMA的综合性能优于纯沥青。机理研究表明，WBO降低了EVA改性沥青中大分子胶束的含量和平均分子量，还稀释了沥青体系中的沥青质成分，导致WEMA在高温下性能略有减弱，在低温下性能显著增强。最终，WBO/EVA复合改性沥青的综合性能更好。
