Asphalt binder modification by crumb rubber modifier (CRM) could enhance its rheological properties at high and intermediate temperatures by increasing its stiffness and elasticity. To obtain a modified binder blend with more enhanced intermediate- and low-temperature rheological properties, used motor oil (UMO) was introduced to the crumb rubber-modified asphalt (CRMA) binder. The enhanced high- and intermediate-temperature rheological properties of the modified binders were investigated using a temperature sweep test. UMO, used as a rejuvenator, can regulate the CRM role in the modified binder blend by creating a balance between the binder’s enhanced stiffness and fluidity. This was achieved by increasing |G*|/sin δ at high temperatures and decreasing |G*|.sin δ at intermediate temperatures. The mutual components between the CRM and the asphalt binder were explored by thermogravimetric analysis and Fourier transform infrared (FTIR) spectroscopy. UMO was found to have similar FTIR bands of the asphalt binder that helped the CRM particles to absorb more low-molecular-weight fractions at the beginning of the interaction time, which caused them to swell more and then dissolve, releasing their polymeric components in the asphalt binder’s liquid phase. Adding UMO with two and half percentage by the weight of the neat asphalt binder to the CRMA binder, interacted at 190°C–50 Hz–60 min, could increase the CRM dissolution and cause a greater release of CRM polymeric components into the asphalt binder matrix. This was assured by the presence of FTIR peaks at 911 and 966 cm⁻¹ that are related to the polybutadiene, synthetic rubber in CRM.

碎橡胶改性剂（CRM）改性沥青粘合剂可以通过增加其刚度和弹性来增强其在高温和中温下的流变性。为了获得具有更高的中，低温流变性能的改性粘合剂共混物，将废机油（UMO）引入到碎橡胶改性沥青（CRMA）粘合剂中。使用温度扫描试验研究了改性粘合剂增强的高温和中温流变性。用作复兴剂的UMO可以通过在粘合剂增强的刚度和流动性之间取得平衡来调节CRM在改性粘合剂混合物中的作用。G * | | /罪这是通过增加达到δ在高温和降低| G * | .sin δ在中间温度下。通过热重分析和傅立叶变换红外（FTIR）光谱分析了CRM和沥青粘合剂之间的相互关系。发现UMO具有类似的沥青粘合剂FTIR谱带，该谱带帮助CRM颗粒在相互作用时间开始时吸收更多的低分子量馏分，这导致它们溶胀更多，然后溶解，从而释放出聚合物组分。沥青粘合剂的液相。在190°C–50 Hz–60分钟下相互作用的情况下，向CRMA粘合剂中添加占纯沥青粘合剂重量2％和一半的UMO，可以增加CRM溶解度，并导致CRM聚合组分更多地释放到沥青粘合剂中矩阵。通过在911和966 cm ^-1处存在FTIR峰可以确保这一点 与CRM中的聚丁二烯，合成橡胶有关。