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Biochar for asphalt modification: A case of high-temperature properties improvement
Science of the Total Environment ( IF 8.2 ) Pub Date : 2021-09-09 , DOI: 10.1016/j.scitotenv.2021.150194 Feng Ma 1 , Jiasheng Dai 1 , Zhen Fu 2 , Chen Li 1 , Yalu Wen 1 , Meng Jia 1 , Yujie Wang 1 , Ke Shi 1
Science of the Total Environment ( IF 8.2 ) Pub Date : 2021-09-09 , DOI: 10.1016/j.scitotenv.2021.150194 Feng Ma 1 , Jiasheng Dai 1 , Zhen Fu 2 , Chen Li 1 , Yalu Wen 1 , Meng Jia 1 , Yujie Wang 1 , Ke Shi 1
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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.
中文翻译：
用于沥青改性的生物炭：高温性能改善的案例
生物炭已被用作可再生生物质资源，以开发可持续和环保的路面。本研究重点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，以综合评价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） 探索生物炭和粘合剂之间的相互作用机制。结果表明，与基体沥青相比，生物炭改性沥青粘结剂的复合模量和渗透力分别提高了 35% 和 36.5%，从而提高了抗变形能力。此外，观察到的复模量、车辙因子和粘度-温度指数的增加有助于改善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状多孔结构并在粘合剂中形成骨架和硬化区。虽然生物炭对粘合剂的低温性能有负面影响，但这可以通过控制生物炭含量来缓解。此外，FTIR 结果表明，将生物炭掺入粘合剂后没有出现新的化学官能团。生物炭改性沥青粘结剂的内部化学环境与基体沥青不同。总之，由于其高温特性，生物炭作为粘合剂的改性剂是可行的。
更新日期：2021-09-09
中文翻译：
用于沥青改性的生物炭：高温性能改善的案例
生物炭已被用作可再生生物质资源，以开发可持续和环保的路面。本研究重点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，以综合评价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） 探索生物炭和粘合剂之间的相互作用机制。结果表明，与基体沥青相比，生物炭改性沥青粘结剂的复合模量和渗透力分别提高了 35% 和 36.5%，从而提高了抗变形能力。此外，观察到的复模量、车辙因子和粘度-温度指数的增加有助于改善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状多孔结构并在粘合剂中形成骨架和硬化区。虽然生物炭对粘合剂的低温性能有负面影响，但这可以通过控制生物炭含量来缓解。此外，FTIR 结果表明，将生物炭掺入粘合剂后没有出现新的化学官能团。生物炭改性沥青粘结剂的内部化学环境与基体沥青不同。总之，由于其高温特性，生物炭作为粘合剂的改性剂是可行的。
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