To evaluate the physical and rheological properties of rejuvenated styrene-butadiene-styrene-modified asphalt (SBSMA) binders designed for rapid in-place pavement recycling, an aged SBSMA binder was rejuvenated with three rejuvenators (i.e., Types I, II, and III) in different dosages. The physical properties of rejuvenated SBSMA were obtained to determine the optimal type and dosage of rejuvenators for the first and second rejuvenation. Performance grade (PG) tests, multiple stress creep recovery (MSCR) tests, and linear amplitude sweep (LAS) tests were conducted to measure the rheological properties using the dynamic shear rheometer (DSR) and bending beam rheometer (BBR). The results exhibited that the rejuvenators could soften the multiple aged binder and enhance its high- and low-temperature performance. The rejuvenation effect of rejuvenator Type I with the optimal dosage of 6∼8% was the most appropriate for the first rejuvenation. The optimal dosage of the second rejuvenation was 10∼12%. The addition of rejuvenators decreased the rutting factor , creep stiffness (S), delta T_c (ΔT_c) parameter, recovery response (R), and yield stress of rejuvenated SBSMA. On the other hand, an increase in the rate of relaxation (m-value), nonrecoverable creep compliance (J_nr), and yield strain of rejuvenated SBSMA was recorded. Overall, the study findings indicated an improvement in the elastic properties of rejuvenated SBSMA, which contributes to improving the rutting, thermal, and fatigue cracking resistance of asphalt binder and ultimately the response of asphalt pavements.

中文翻译：

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评估再生的苯乙烯-丁二烯-苯乙烯改性的沥青粘合剂的物理和流变性质

为了评估专为快速就地路面回收而设计的再生苯乙烯-丁二烯-苯乙烯改性沥青（SBSMA）粘合剂的物理和流变性能，使用三种再生剂（即I，II和III型）使老化的SBSMA粘合剂再生。以不同的剂量。获得再生的SBSMA的物理性质，以确定用于第一次和第二次再生的最佳再生剂类型和剂量。使用动态剪切流变仪（DSR）和弯曲束流变仪（BBR）进行了性能等级（PG）测试，多次应力蠕变恢复（MSCR）测试和线性幅度扫描（LAS）测试，以测量流变性能。结果表明，再生剂可以软化多种老化的粘结剂并增强其高温和低温性能。最佳剂量为6〜8％的I型再生剂的再生效果最适合第一次再生。第二次复兴的最佳剂量为10〜12％。添加嫩肤剂可降低车辙因子，蠕变刚度（ S）， ΔT _c（ ΔT _c）参数，恢复响应（ R）和再生的SBSMA的屈服应力。另一方面，记录了松弛后的SBSMA的松弛率（ m值），不可恢复的蠕变顺应性（ J _nr）和屈服应变的增加。总体而言，研究结果表明，再生的SBSMA的弹性性能得到改善，这有助于改善沥青粘合剂的耐车辙性，耐热性和疲劳龟裂性，并最终改善沥青路面的响应性。