Abstract:

Due to different aging levels of reclaimed asphalt pavement, it is difficult to meet the requirements of pavement performance with one rejuvenator used in the mixing proportions of asphalt mixture. Base oils, plasticizers, tackifying resin and anti-aging materials were used to prepare the rejuvenator. Based on extremum difference analysis and response surface methodology, the performance of rejuvenator was tested by flash point, thermogravimetry-derivative thermogravimetry and four-component experiments. Penetration, ductility and rheological properties of rejuvenated asphalt were tested to verify aging quality resistance and rejuvenated effects. The results indicated that mixing proportions of rejuvenator under multiple influencing factors could be effectively improved with the combination of extremum difference analysis and response surface methodology. As the asphalt aging level increased, the tackifying resin content decreased and plasticizers content increased in requirement of rejuvenator. it was required that rejuvenator should contain at least 45% or more of heavy components to ensure its thermal stability. Residual needle penetration and ductility could be used to evaluate the anti-aging performance of rejuvenator.

Key words: asphalt, rejuvenator, response surface method, thermostability, anti-aging performance

摘要：

沥青路面回收料由于老化程度不同，采用一种再生剂进行再生沥青混合料配合比设计，其路用性能难以满足使用要求。因此本文针对不同老化程度的沥青选用基础油分、增塑剂、增黏树脂及抗老化材料为原材料，采用极差分析法及响应曲面法制备沥青再生剂，通过闪点、差热-热重法、四组分分析等测试对再生剂性能进行分析，并且对再生沥青的针入度、延度以及流变性能等进行测试，验证其抗老化性能以及再生效果。结果表明：响应曲面法结合极差分析法可以有效提高多影响因素下再生剂配比设计；随着沥青老化程度的增加，所需再生剂中增黏树脂的含量会降低、增塑剂的含量会增大，再生剂中应具有45%以上的重质组分保证再生剂的热稳定性；残留针入度以及延度可以对再生剂的抗老化的性能进行评价。

关键词: 沥青, 再生剂, 响应曲面法, 热稳定性, 抗老化性能