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Abstract：
Biochar has been utilized as a renewable biomass resource to develop sustainable and eco-friendly pavements. This study focuses on the influence of biochar as an asphalt modifier on the improvement of high-temperature performance of asphalt. A series of tests were performed to comprehensively evaluate the high-temperature performance of the biochar modified binder. The interaction mechanism between the biochar and the binder was explored using scanning electron microscopy and Fourier-transform infrared spectroscopy (FTIR). The results indicated that the complex modulus and penetration of the biochar-modified asphalt binder could be increased by up to 35% and 36.5%, respectively, compared with those in case of the matrix asphalt, thereby improving the deformation resistance. In addition, the observed increase in the complex modulus, rutting factor, and viscosity-temperature index contributed to the improvement of temperature sensitivity and anti-rutting properties. These relationships are attributed to the fact that biochar has a fibrous porous structure and forms a skeleton and stiffening zone in the binder. Although biochar has a negative effect on the low-temperature properties of the binder, this can be alleviated by controlling the biochar content. Moreover, the FTIR results showed that no new chemical functional groups appeared after the incorporation of biochar into the binder. The internal chemical environment of the biochar-modified asphalt binder was different from that of the matrix asphalt. In conclusion, biochar is feasible as a modifier for binders owing to its high-temperature properties.
摘要：
生物炭已被用作可再生生物质资源，以开发可持续和生态友好的路面。研究了生物炭作为沥青改性剂对沥青高温性能改善的影响。进行了一系列测试以全面评估生物炭改性粘合剂的高温性能。使用扫描电子显微镜和傅里叶变换红外光谱（FTIR）研究了生物炭与粘合剂之间的相互作用机理。结果表明,生物炭改性沥青结合料的复合模量和针入度可分别提高35%和36.5%,分别,与基质沥青相比，从而提高了抗变形性。此外,观察到的复数模量的增加，车辙因素,和粘度-温度指数有助于提高温度敏感性和抗车辙性能。这些关系归因于生物炭具有纤维多孔结构并在粘合剂中形成骨架和硬化区的事实。虽然生物炭对粘结剂的低温性能有负面影响，这可以通过控制生物炭含量来缓解。此外，FTIR结果表明，生物炭掺入粘合剂后没有新的化学官能团出现。生物炭改性沥青结合料的内部化学环境与基质沥青的内部化学环境不同。总之,由于其高温性能，生物炭作为粘合剂的改性剂是可行的。
