This study prepared foamed waste oil-activated rubberized asphalt (ORA) by activating crumb rubber (CR) with waste vegetable oil (WVO) to address the issue of undesirable foaming effect. Optimal foaming parameters for different rubberized asphalt were determined based on foaming characteristic experiments. Furthermore, rheological properties, fatigue resistance, and adhesion performance of various unfoamed or foamed rubberized asphalt were evaluated through dynamic shear rheometer, bending beam rheometer, pull-out tests. Finally, the analytic hierarchy process was utilized to select the optimum foamed rubberized asphalt. The results show that foaming pressure has a great influence on rubberized asphalt foaming effect, and is recommended at 300 kPa. Compared to conventional rubberized asphalt whether foamed or not, with the increase of activation degree, low-temperature performance, and fatigue resistance of ORA are significantly ameliorated, and the adhesion property of ORA first increases and then decreases, but detrimental to high-temperature performance. The foaming process and foaming agent addition are conducive to low-temperature performance but unfavorable to fatigue resistance and high-temperature property, and have little effect on adhesion performance. ORA (mass ratio of WVO to CR is 1:5) with foaming agent is determined as the optimum selection.

中文翻译：

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泡沫废油活化橡胶沥青粘合剂：提高发泡效果和性能的可持续回收方法

本研究通过用废植物油（WVO）活化胶粉（CR）制备泡沫废油活化橡胶沥青（ORA），以解决不良发泡效果的问题。通过发泡特性实验，确定了不同橡胶沥青的最佳发泡参数。此外，通过动态剪切流变仪、弯梁流变仪、拉拔试验等评价了各种未发泡或发泡橡胶沥青的流变性能、抗疲劳性能和附着性能。最后利用层次分析法优选出最佳的泡沫橡胶沥青。结果表明，发泡压力对橡胶沥青发泡效果影响较大，推荐采用300 kPa。与常规橡胶沥青相比，无论是否发泡，随着活化度的增加，ORA的低温性能和抗疲劳性能均显着改善，且ORA的粘附性能先增大后减小，但对高温性能不利。发泡工艺和发泡剂添加有利于低温性能，但不利于耐疲劳性能和高温性能，对粘合性能影响不大。确定ORA（WVO与CR质量比为1：5）配合发泡剂为最佳选择。