Abstract: To investigate the effectiveness of performance testing procedures and technical parameters for rejuvenated asphalts, fatigue performance and low-temperature cracking resistance recovery was taken as the research objective, and the wide-temperature-range rheological test, low-temperature creep test, and ductile cracking failure tests were conducted. Cracking parameters, including intermediate continuous grading temperature (TICG), Glover-Rowe parameter (PG-R), limiting phase angle temperature (T30°, T45°, ΔTcδ), low-temperature continuous grading temperature (1 h TCLG, 72 h TCLG), grade loss (LG), and critical tip opening displacement (DCTO), were selected to investigate the impact of multi-source oil rejuvenators (AAS, Cargill, Cyclogen, REOB) and their dosages (2%, 4%, 8%) on the crack resistance of rejuvenated asphalt. Pearson correlation analysis was used to assess the effectiveness of different cracking parameters, and the optimal dosage ranges for rejuvenators were determined on the basis of the preferred parameters. The results indicate that chemical aging is an irreversible process. The parameters related to gelation, ΔTcδ and DCTO, exhibit a slow trend or almost no change with increasing rejuvenator dosage. Limiting phase angle temperature is a potential effective indicator for evaluating the thermal cracking resistance of asphalt binders, which can be obtained through a relatively simple testing procedure. The lower limit of rejuvenator dosage was determined on the basis of the limiting phase angle temperature, whose value closely aligns with the actual amount in engineering. Compared to TICG, PG-R is a better option for assessing the cracking of aged/rejuvenated asphalts. According to the preferred parameters, the regeneration efficiency ranking and dosage range for the three selected commodity rejuvenators are determined as follows: Cargill (3.4%~8.9%) > AAS (6.5%~15.6%) > Cyclogen (10.5%~18.4%).

Key words: highway engineering; rejuvenated asphalt; rheological properties; limiting phase angle temperature; rejuvenation efficient

摘要： 为调查再生沥青性能测试程序和技术指标的有效性，以疲劳及低温抗裂性能恢复为研究对象，开展宽温域流变试验、低温蠕变试验和延性开裂破坏试验。选取中温连续分级温度（TICG）、Glover-Rowe参数（PG-R）、限制相位角温度（T30°、T45°、ΔTcδ）、低温连续分级温度（1 h TCLG、72 h TCLG）、等级损失（LG）和临界开裂位移（DCTO）作为开裂参数，研究了多来源油再生剂（AAS、Cargill、Cyclogen、REOB）和掺量（2%、4%、8%）对再生沥青抗裂性能的影响。采用Pearson相关性分析评价了不同开裂参数的有效性，并基于优选的开裂参数确定再生剂的最佳掺量范围。结果表明：化学老化是不可逆过程，胶凝化相关的参数ΔTcδ和DCTO随再生剂掺量的增加，其变化趋势缓慢或几乎无变化。限制相位角温度是潜在的评价沥青黏结剂抗热裂的有效指标，能够通过相对简单的测试程序获取。基于限制相位角温度能够确定再生剂掺量范围的下限，并且其值与工程中的实际用量相近。相比于TICG，PG-R是评价老化/再生沥青开裂的更佳选择。根据优选参数，确定选择的3种商品再生剂的再生效率排序和掺量范围为：Cargill（3.5%~8.9%）＞AAS（6.5%~15.6%）＞Cyclogen（10.4%~18.4%）。

关键词: 道路工程；再生沥青；流变性能；限制相位角温度；再生效率