Hemmati Navid, Yun Jihyeon, Mazumder Mithil, 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). 2021 Dec 12;14(24):7666. doi: 10.3390/ma14247666.
The study describes the laboratory assessment (physical and rheological properties) of the binders (PG 64-22 and PG 76-22) modified with Styrene Butadiene Rubber (SBR), and a comprehensive comparison between these two modified binder types. PG 64-22 and PG 76-22 were used as base binders. Both of the base binders were blended with SBR at four different percentages of content (0%, 4%, 6%, and 8% by the weight of the binder). 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 conducted on the SBR modified binder using rotational viscometer (RV), dynamic shear rheometer (DSR), and bending beam rheometer (BBR). In depth rutting performance was investigated using Multiple Stress Creep Recovery (MSCR). The results of this study indicated that (1) the addition of SBR into both binders increased the viscosity and polymer modified asphalt (PMA) binders observed to have more significant effect on its viscosity property; (2) the higher the SBR content, the better the rutting resistance of the binder and it is observed that the effect is prominent on the control binder; (3) MSCR test results showed that the SBR modified binders improved the binder percentage recovery and found to have a more significant effect on the PG 76-22 binder compared to PG 64-22; and (4) both the control PG 64-22 and PMA PG 76-22 binders resulted in similar trends on the cracking properties and were found to have insignificant effects due to the addition of an SBR modifier.
该研究描述了用丁苯橡胶（SBR）改性的粘结剂（PG 64-22和PG 76-22）的实验室评估（物理和流变性能），并对这两种改性粘结剂类型进行了全面比较。PG 64-22和PG 76-22用作基础粘结剂。两种基础粘结剂均与SBR按四种不同的含量百分比（占粘结剂重量的0%、4%、6%和8%）混合。基础粘结剂和改性粘结剂通过旋转薄膜烘箱（RTFO）和压力老化容器（PAV）程序进行人工短期和长期老化。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SBR改性粘结剂进行了Superpave粘结剂试验。使用多重应力蠕变恢复（MSCR）研究了深度车辙性能。该研究结果表明：（1）两种粘结剂中添加SBR均提高了粘度，且观察到聚合物改性沥青（PMA）粘结剂对其粘度性能有更显著影响；（2）SBR含量越高，粘结剂的抗车辙性能越好，且观察到对对照粘结剂的影响尤为显著；（3）MSCR试验结果表明，SBR改性粘结剂提高了粘结剂的百分比恢复率，且与PG 64-22相比，对PG 76-22粘结剂的影响更为显著；（4）对照PG 64-22和PMA PG 76-22粘结剂在开裂性能方面呈现相似趋势，且发现添加SBR改性剂的影响不显著。
