TY - JOUR ID - 157270 TI - Research on the Adhesion and Self-healing Properties of Bio-asphalt Based on Molecular Simulation JO - Advance Researches in Civil Engineering JA - ARCE LA - en SN - AU - Fu, Yuan AU - Wu, Meng AU - Hei, Tianqing AU - Dong, Zezhen AU - Hu, Jianying AU - Zhang, Weiguang AD - Highway Administration of Shanxi Province, Taiyuan, China AD - Department of Road Engineering, School of Transportation, Southeast University, Nanjing, China AD - School of Transportation, Southeast University, 211189, Nanjing, China AD - Department of Road Engineering, School of Transportation,Southeast University, Nanjing, China Y1 - 2022 PY - 2022 VL - 4 IS - 2 SP - 24 EP - 43 KW - Bio-asphalt KW - interfacial adhesion KW - Self-healing performance KW - Molecular Simulation DO - 10.30469/arce.2022.157270 N2 - At present, the extraction of new bio-asphalt materials from renewable energy sources has become the focus of research in the field of pavement engineering. Bio-asphalt has the characteristics of wide source, low cost, green, pollution-free and is also renewable. With the expansion of the application range of bio-asphalt, its adhesion to aggregates and the healing properties after damage have received extensive attention. In this paper, the bio-asphalt-aggregate adhesion and healing behaviors were evaluated and compared using molecular dynamics approaches. Firstly, the molecular models of vegetable oil bio-asphalt and waste edible oil were established, and the two bio-asphalt molecular models were verified according to the physical quantities such as density, viscosity, cohesive energy density (CED), glass transition temperature and solubility parameter. Then, the bio-asphalt-aggregates interlayer model was established, and the adhesion energy and the energy ratio (ER) value under water conditions were calculated and analyzed using energy theory. A bio-asphalt self-healing model was established, and concentration distribution and diffusion analysis were performed. The results show that the viscosity of bio-asphalt is significantly lower than that of base asphalt, and the shear resistance becomes lower at high temperature. In terms of adhesion, bio-asphalt has better temperature sensitivity. The two bio-asphalts have better adhesion than base asphalt and silica at different temperatures, especially at high temperature (65 °C). There was no significant difference between the adhesion energy of the two bio-asphalts. Bio-asphalt is more affected by water intrusion, and its ability to resist water damage is significantly weaker than that of base asphalt. The NPT density-time curve, concentration distribution and MSD calculation results all showed that the self-healing performance of bio-asphalt was better than that of base asphalt, while the two bio-asphalts showed little difference in healing performance. UR - https://www.arce.ir/article_157270.html L1 - https://www.arce.ir/article_157270_0e34b73389fe58b82a90a75fc41d6ba5.pdf ER -