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<p>Waste plastics (WPs) are used for asphalt modification, which is not only a means of high-value recycling of WPs, but also a means of improvement of high-temperature performance of asphalt. However, WPs and asphalt are poorly compatible, that can be improved by pyrolysis of WPs. The effect of pyrolysis waste plastic products (PWP) with different pyrolysis durations on asphalt properties was investigated. Firstly, PWP with different pyrolysis durations (PWP1, pyrolysis for 15mins; PWP2, pyrolysis for 30mins; PWP3, pyrolysis for 45mins) were obtained. Then, the viscosity-temperature characteristic and rheological property of pyrolysis products modified asphalt (PWP1MA, PWP2MA, PWP3MA) were characterized. Finally, enhancement mechanism of PWPMA was revealed by microstructural and thermodynamic properties of PWP and modified asphalt. The results showed that PWP improved deformation resistance at high temperature, fatigue resistance at normal temperature, and viscosity-temperature characteristic of asphalt, where, compared to the viscosity of JZ, that of PWP2MA was reduced by about 0.12&#xa0;Pa·s after 130&#xa0;°C. Compared to cracking resistance at low temperature of PWPMA were well improved compared to that of low-density polyethylene modified asphalt (LDPEMA), and PWP mainly physically modified asphalt. Based on the thermodynamic properties, PWP2 showed better crystalline morphology and higher enthalpy of fusion, which was able to reduce viscosity of asphalt at high temperatures. PWP can effectively improve rheological properties and the viscosity-temperature characteristic of asphalt, so PWP for functional modification of asphalt has bright future.</p>

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Study on Rheological Properties and Microscopic Structures of Pyrolytic Polyethylene Modified Asphalt

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Jinwei Xu,
  • Jianguang Xie,
  • Yangwei Tan

摘要

Waste plastics (WPs) are used for asphalt modification, which is not only a means of high-value recycling of WPs, but also a means of improvement of high-temperature performance of asphalt. However, WPs and asphalt are poorly compatible, that can be improved by pyrolysis of WPs. The effect of pyrolysis waste plastic products (PWP) with different pyrolysis durations on asphalt properties was investigated. Firstly, PWP with different pyrolysis durations (PWP1, pyrolysis for 15mins; PWP2, pyrolysis for 30mins; PWP3, pyrolysis for 45mins) were obtained. Then, the viscosity-temperature characteristic and rheological property of pyrolysis products modified asphalt (PWP1MA, PWP2MA, PWP3MA) were characterized. Finally, enhancement mechanism of PWPMA was revealed by microstructural and thermodynamic properties of PWP and modified asphalt. The results showed that PWP improved deformation resistance at high temperature, fatigue resistance at normal temperature, and viscosity-temperature characteristic of asphalt, where, compared to the viscosity of JZ, that of PWP2MA was reduced by about 0.12 Pa·s after 130 °C. Compared to cracking resistance at low temperature of PWPMA were well improved compared to that of low-density polyethylene modified asphalt (LDPEMA), and PWP mainly physically modified asphalt. Based on the thermodynamic properties, PWP2 showed better crystalline morphology and higher enthalpy of fusion, which was able to reduce viscosity of asphalt at high temperatures. PWP can effectively improve rheological properties and the viscosity-temperature characteristic of asphalt, so PWP for functional modification of asphalt has bright future.