Wang Xiaofeng, Liu Jianan, Wang Zhenjun, Jing Haosen, Yang Bo
Henan Provincial Communications Planning & Design Institute, Zhengzhou 450052, China.
School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China.
Polymers (Basel). 2022 Dec 14;14(24):5474. doi: 10.3390/polym14245474.
The use of waste tires to prepare rubberized asphalt has been a hot trend in recent years, and the characteristics of adhesion between rubberized asphalt and aggregates are important factors affecting the performance of asphalt pavement. However, there is a lack of uniform results on the adhesion characteristics of rubberized asphalt. Therefore, crumb-rubber-modified asphalt (CRMA) with 15%, 20%, and 25% rubber contents was prepared in this work, and the basic rheological parameters and cohesive energy of the rubberized asphalt were characterized by DSR. The adhesion properties between rubberized asphalt and aggregates were characterized based on macroscopic binder bond strength (BBS), surface free energy (SFE) theory, and nanoscale atomic force microscopy (AFM) tests. The results show that crumb rubber (CR) can improve the high-temperature elastic properties of asphalt; secondly, CR can have a negative impact on the maximum tensile strength of asphalt and aggregates. CR can improve the SFE parameter of asphalt. The work of adhesion of rubberized asphalt and limestone is the highest, followed by basalt and, finally, granite. Finally, CR can cause the catanaphase in asphalt to gradually break down and become smaller, and the adhesion of rubberized asphalt can be reduced. Overall, CR can reduce the adhesion performance of asphalt, and this work provides a reference for the application of rubberized asphalt.
近年来，利用废旧轮胎制备橡胶沥青已成为一种热门趋势，橡胶沥青与集料之间的粘附特性是影响沥青路面性能的重要因素。然而，关于橡胶沥青粘附特性的研究结果并不统一。因此，本研究制备了橡胶含量分别为15%、20%和25%的橡胶粉改性沥青（CRMA），并采用动态剪切流变仪（DSR）对橡胶沥青的基本流变参数和内聚能进行了表征。基于宏观粘结强度（BBS）、表面自由能（SFE）理论和纳米级原子力显微镜（AFM）试验，对橡胶沥青与集料之间的粘附性能进行了表征。结果表明，橡胶粉（CR）可以改善沥青的高温弹性性能；其次，CR会对沥青与集料的最大拉伸强度产生负面影响。CR可以提高沥青的SFE参数。橡胶沥青与石灰岩的粘附功最高，其次是玄武岩，最后是花岗岩。最后，CR会导致沥青中的尾相逐渐分解变小，从而降低橡胶沥青的粘附性。总体而言，CR会降低沥青的粘附性能，本研究为橡胶沥青的应用提供了参考。
