Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Research on the self-healing behavior of asphalt mixed with healing agents based on molecular dynamics method
Highlights A model of asphalt microcrack containing healing agents is established. A short-term aged asphalt model is established. Models of plant oil and aromatic oil as typical healing agents are established. A method for analyzing asphalt self-healing rate by diffusion coefficient is proposed.
Abstract Molecular dynamics is used to simulate the self-healing process of asphalts mixed with a healing agent. Sulfoxide functional groups were introduced into the virgin asphalt to produce a short-term-aged asphalt model. The model is validated by comparing density, diffusion coefficient, solubility parameter, and viscosity with real measurements. Plant oil and Aromatic oil are chosen as typical healing agents. The molecular models of asphalt and healing agent are integrated into a micro-crack model, and the healing process is simulated with molecular dynamics. The results show that Plant oil is a better choice for improving the healing rate of virgin asphalt, while Aromatic oil is better for improving the healing rate of short-term-aged asphalt. The higher the temperature is, the better effect the healing agent will have on the asphalt. Healing is maximized above 15 °C for virgin asphalt and above 45 °C for short-term-aged asphalt. Molecular simulations show that the healing process depends on the diffusion of the healing agent and asphalt into the micro-crack. After the crack is filled, bitumen and oil molecules continue to mix. Aromatic oil produces a better mixing that leads to a more uniform composition and better mechanical properties.
Research on the self-healing behavior of asphalt mixed with healing agents based on molecular dynamics method
Highlights A model of asphalt microcrack containing healing agents is established. A short-term aged asphalt model is established. Models of plant oil and aromatic oil as typical healing agents are established. A method for analyzing asphalt self-healing rate by diffusion coefficient is proposed.
Abstract Molecular dynamics is used to simulate the self-healing process of asphalts mixed with a healing agent. Sulfoxide functional groups were introduced into the virgin asphalt to produce a short-term-aged asphalt model. The model is validated by comparing density, diffusion coefficient, solubility parameter, and viscosity with real measurements. Plant oil and Aromatic oil are chosen as typical healing agents. The molecular models of asphalt and healing agent are integrated into a micro-crack model, and the healing process is simulated with molecular dynamics. The results show that Plant oil is a better choice for improving the healing rate of virgin asphalt, while Aromatic oil is better for improving the healing rate of short-term-aged asphalt. The higher the temperature is, the better effect the healing agent will have on the asphalt. Healing is maximized above 15 °C for virgin asphalt and above 45 °C for short-term-aged asphalt. Molecular simulations show that the healing process depends on the diffusion of the healing agent and asphalt into the micro-crack. After the crack is filled, bitumen and oil molecules continue to mix. Aromatic oil produces a better mixing that leads to a more uniform composition and better mechanical properties.
Research on the self-healing behavior of asphalt mixed with healing agents based on molecular dynamics method
He, Liang (Autor:in) / Zheng, Yufeng (Autor:in) / Alexiadis, Alessio (Autor:in) / Cannone Falchetto, Augusto (Autor:in) / Li, Guannan (Autor:in) / Valentin, Jan (Autor:in) / Van den bergh, Wim (Autor:in) / Emmanuilovich Vasiliev, Yuri (Autor:in) / Kowalski, Karol J. (Autor:in) / Grenfell, James (Autor:in)
19.04.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Investigation into crack healing of asphalt mixtures using healing agents
| British Library Online Contents | 2018
Investigation into crack healing of asphalt mixtures using healing agents
| British Library Online Contents | 2018