| 摘要: |
| 分别制备了热氧老化沥青和热氧-紫外老化沥青，构建了新、旧沥青双层扩散模型，并且通过相对浓度与扩散系数的模拟计算、拉拔试验与荧光显微镜试验研究了新、旧沥青扩散融合程度与温度、沥青四组分的关系. 结果表明：热氧-紫外老化沥青更不易与基质沥青扩散融合，与基质沥青的黏附性较差；在10~40 ℃内，新、旧沥青能够快速扩散融合，超过40 ℃后，升高温度对扩散融合的促进作用逐渐减小，且对热氧-紫外老化沥青与基质沥青的扩散融合促进作用的减小速率更大；沥青四组分扩散系数的大小顺序依次为：饱和分>芳香分≥胶质>沥青质，经紫外老化后，四组分的扩散系数均有所下降，沥青质的降幅最大. |
| 关键词: 道路工程 新旧沥青双层扩散模型 分子动力学 老化沥青 相对浓度 扩散系数 拉拔试验 |
| DOI：10.3969/j.issn.1007-9629.2024.02.004 |
| 分类号:U414 |
| 基金项目: |
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| Diffusion of Virgin and Aging Asphalt in Different Aging Methods |
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LI Xiujun1, DONG Liming2, SUN Yue1, ZHANG Heng1, ZHAO Linhao3
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1.School of Environment and Architecture， University of Shanghai for Science and Technology， Shanghai 200093， China;2.Netfortune （Shanghai） Aluminum Works Co.，Ltd.， Shanghai 200030， China;3.Zhejiang Zhixin Testing Technology Co.， Ltd.， Jiaxing 314000， China
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| Abstract: |
| Thermo-oxygen aging asphalt and thermal oxygen-ultraviolet aging asphalt were prepared. The double-layers diffusion model of virgin and aging asphalt was constructed. Through the simulation calculation of relative concentration and diffusion coefficient， verification of pull-off tensile test and fluorescence microscope test， the relationship of diffusion degree with temperature and four components was analyzed. The results show that the thermal oxygen-ultraviolet aging asphalt is more difficult to diffusion with the virgin asphalt， and the adhesion with the virgin asphalt is poor. In the range of 10 ℃ to 40 ℃， the virgin and aging asphalt can diffuse rapidly. When the temperature is over 40 ℃， the promoting effect of increasing temperature on diffusion gradually decreases. The decreasing rate of promoting effect is greater for the diffusion of thermal oxygen-ultraviolet asphalt and virgin asphalt. The diffusion coefficients of four components of asphalt from large to small are in the order： saturate>aromatic≥resin>asphaltene. After ultraviolet aging， the diffusion coefficients of the four components decrease. Among them， asphaltene declines most significantly. |
| Key words: road engineering double-layers diffusion model of virgin and aging asphalt molecular dynamic aging asphalt relative concentration diffusion coefficient pull-off tensile test |
