泡沫沥青再生沥青路面胶结料的多尺度评价

Multi-scale evaluation of foamed asphalt recycled asphalt pavement

以用水量和沥青发泡温度作为两个主要控制参数进行正交试验,确定沥青发泡合适的制备条件.根据生产调和沥青的原理,将不同掺量的泡沫沥青和基质沥青分别添加到老化沥青中对老化沥青进行再生试验研究,采用旋转黏度与针入度作为评价再生沥青性能的关键指标来衡量沥青再生效果.结合相位角、车辙因子、疲劳因子和黏度等与温度的关系曲线,从流变学角度分析泡沫沥青和基质沥青对老化沥青再生效果的差异性.试验研究表明:相较于传统基质沥青,泡沫沥青再生沥青路面胶结料的性能更好,泡沫沥青内部存在的水分子结构能增强沥青流动性和融合性,增大泡沫沥青与老化沥青的接触面积,补充老化沥青缺失的组分.利用傅里叶红外光谱仪和扫描电镜,从微观角度揭示沥青再生过程和物质变化规律.

The orthogonal test was carried out with water consumption and asphalt foaming temperature as two main control parameters to determine the suitable preparation conditions for asphalt foaming.According to the production principle of blended asphalt,different amounts of foamed asphalt and matrix asphalt were separately added to aged asphalt to carry out regeneration test on aged asphalt.Rotating viscosity and penetration were used as key indicators to evaluate the performance of recycled asphalt and measure asphalt regeneration.Combining phase angle,rutting factor,fatigue factor and viscosity-temperature relationship curve,the difference of regeneration effect between foamed asphalt and matrix asphalt on aged asphalt was analyzed from the rheological point of view.The experimental research shows that compared with the traditional matrix asphalt,the performance of foamed asphalt recycled asphalt pavement binder is better.The water molecular structure existing inside the foamed asphalt can enhance the asphalt fluidity and fusion performance,and the contact area between foamed asphalt and aged asphalt is increased to supplement the missing components of aged asphalt.Fourier infrared spectroscopy and electron microscopy were used to reveal the asphalt regeneration process and material change law from microscopic perspective.