Research on the Adhesion and Self-healing Properties of Bio-asphalt Based on Molecular Simulation
Publish place: Advance Researches in Civil Engineering، Vol: 4، Issue: 2
Publish Year: 1401
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_ARCE-4-2_003
تاریخ نمایه سازی: 2 مهر 1401
Abstract:
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 (۶۵ °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.
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Authors
Yuan Fu
Highway Administration of Shanxi Province, Taiyuan, China
Meng Wu
Department of Road Engineering, School of Transportation, Southeast University, Nanjing, China
Tianqing Hei
School of Transportation, Southeast University, ۲۱۱۱۸۹, Nanjing, China
Zezhen Dong
School of Transportation, Southeast University, ۲۱۱۱۸۹, Nanjing, China
Jianying Hu
Department of Road Engineering, School of Transportation, Southeast University, Nanjing, China
Weiguang Zhang
Department of Road Engineering, School of Transportation,Southeast University, Nanjing, China
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