Cheng Peifeng, Qiao Pengcheng, Zheng Chunmeng, Liu Ziyu, Zhang Zhanming, Li Yiming
School of Civil and Transportation Engineering, Northeast Forestry University (NEFU), Harbin 150040, China.
Jiangsu Expressway Engineering Maintenance Technology Co., Ltd., Nanjing 211106, China.
Materials (Basel). 2023 Sep 28;16(19):6464. doi: 10.3390/ma16196464.
In order to investigate the influence of recycling agent composition on the recycling effect of aged asphalt in the cold recycling process, the design and optimization of cold recycling agent composition were performed through the central composite design-response surface method combined with the dynamic shear rheometer (DSR) test and the bending beam rheometer (BBR) test. The molecular weight distribution and component changes in aged asphalt before and after the addition of a cold recycling agent were also analyzed by gel permeation chromatography (GPC) and hydrogen-flame ionization test. The results showed that the permeable cold recycling agent has a recycling effect on the aged asphalt, but its effectiveness is greatly affected by recycling agent composition. The best recycling effect was achieved when the ratio of aromatic oil and penetrant in the cold recycling agent was 61.2:38.8, respectively. In terms of the recycling agent and aromatic functional groups in the aromatic oil, the aromatics in the recycling agent are derived from the aromatic oils, and the penetrant is only fused and permeated with the aromatic oils. After the admixture of the cold recycling agent, the penetrant in the recycling agent allows the aromatic oil to enter the aged asphalt at room temperature. The light components volatilized by aging are replenished, allowing the aged asphalt to recover some of its properties.
为了研究再生剂组成对冷再生过程中老化沥青再生效果的影响，采用中心复合设计-响应面法结合动态剪切流变仪（DSR）试验和弯曲梁流变仪（BBR）试验，对冷再生剂组成进行了设计与优化。还通过凝胶渗透色谱法（GPC）和氢火焰离子化试验分析了添加冷再生剂前后老化沥青的分子量分布和组分变化。结果表明，渗透型冷再生剂对老化沥青具有再生效果，但其效果受再生剂组成的影响较大。当冷再生剂中芳烃油与渗透剂的比例分别为61.2:38.8时，再生效果最佳。就再生剂和芳烃油中的芳香官能团而言，再生剂中的芳烃来源于芳烃油，渗透剂仅与芳烃油融合并渗透。冷再生剂掺配后，再生剂中的渗透剂使芳烃油在室温下进入老化沥青。老化挥发的轻质组分得到补充，使老化沥青恢复部分性能。
