Hemmati Navid, Yun Jihyeon, Kim Hyunhwan, Lee Moon-Sup, Lee Soon-Jae
Department of Engineering Technology, Texas State University, San Marcos, TX 78666, USA.
Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea.
Materials (Basel). 2022 May 24;15(11):3739. doi: 10.3390/ma15113739.
This study investigates the effectiveness of processed oil in the modification of PG 64-22 and PG 76-22 by assessing their physical and rheological properties, and multiple comparison was conducted between the two binders. The base binders PG 64-22 and PG 76-22 were blended with processed oil at four different percentages of contents (3%, 6%, 9% and 12% by the weight of the binder) and compared with the control binder in each test. The base and modified binders were artificially short-term and long-term aged using a rolling thin film oven (RTFO) and pressure aging vessel (PAV) procedures. Superpave binder tests were performed on the modified binders by applying a rotational viscometer (RV), dynamic shear rheometer (DSR), and bending beam rheometer (BBR). The comparisons and results presented in this study indicate that (1) the processed oil has a significant effect on the binders' viscosity, which changes with respect to the increment of processed oil content. The viscosity of both modified binders decreased with the addition of 3, 6, 9 and 12% processed oil; (2) the performed DSR test showed that the addition of processed oil had a negative effect on the rutting resistance for both binders, since in PG 64-22, G*/Sin values decreased by 55, 65, 75 and 83% with the addition of 3, 6, 9 and 12% processed oil, respectively, while a decrement of G*/Sin of 24, 45, 58 and 65% with the addition of 3, 6, 9 and 12% processed oil was observed in PG 76-22; meanwhile, the fatigue cracking performance was improved and was found to be effective, while G* Sin in PG76-22 decreased by 9, 30, 36, and 52% and in PG 64-22 by 27, 44, 53, and 67% with the addition of 3, 6, 9 and 12% processed oil; (3) the results from the BBR test indicate significant improvement in the thermal cracking properties of the binders. The addition of 3, 6, 9 and 12% processed oil resulted in a decrease in the stiffness of both the PG 64-22 and PG 76-22 binders, with a positive effect consequently being observed on the m-values of the binders.
本研究通过评估PG 64 - 22和PG 76 - 22的物理和流变性能，研究了加工油对其改性的有效性，并对这两种粘结剂进行了多重比较。将基础粘结剂PG 64 - 22和PG 76 - 22与加工油按四种不同含量百分比（占粘结剂重量的3%、6%、9%和12%）进行混合，并在每次测试中与对照粘结剂进行比较。基础粘结剂和改性粘结剂采用旋转薄膜烘箱（RTFO）和压力老化容器（PAV）程序进行人工短期和长期老化。通过使用旋转粘度计（RV）、动态剪切流变仪（DSR）和弯曲梁流变仪（BBR）对改性粘结剂进行Superpave粘结剂试验。本研究给出的比较结果表明：（1）加工油对粘结剂的粘度有显著影响，粘度随加工油含量的增加而变化。两种改性粘结剂的粘度均随添加3%、6%、9%和12%的加工油而降低；（2）进行的DSR试验表明，添加加工油对两种粘结剂的抗车辙性能有负面影响，因为在PG 64 - 22中，随着添加3%、6%、9%和12%的加工油，G*/Sin值分别降低了55%、65%、75%和83%，而在PG 76 - 22中，随着添加3%、6%、9%和12%的加工油，G*/Sin值降低了24%、45%、58%和65%；同时，疲劳开裂性能得到改善且被发现是有效的，随着添加3%、6%、9%和12%的加工油，PG76 - 22中的G* Sin值降低了9%、30%、36%和52%，PG 64 - 22中的G* Sin值降低了27%、44%、53%和67%；（3）BBR试验结果表明粘结剂的热裂性能有显著改善。添加3%、6%、9%和12%的加工油导致PG 64 - 22和PG 76 - 22粘结剂的刚度降低，从而对粘结剂的m值产生了积极影响。
