材料期刊网

为了研究废旧轮胎橡胶灰分用于改性沥青的性能,通过高温热分解方法制备橡胶灰分,并以0%~5.0%掺量对2种基质沥青进行改性.采用沥青三大指标、动态剪切流变试验、针入度指数、布氏粘度、弹性恢复、薄膜烘箱试验和离析试验,评价了橡胶灰分对沥青高、低温性能、温度敏感性、粘温性能、弹性恢复、老化性能和储存稳定性的影响.同时借助扫描电镜观察橡胶灰分的微观形貌,利用荧光显微镜分析改性沥青的均匀程度.结果表明:废旧轮胎橡胶灰分可显著提高沥青的高温性能,降低其温度敏感性,改善其粘温性能;当其掺量低于3.0%时,沥青的弹性恢复得到显著改善,而沥青的低温性能、老化性能和储存稳定性无明显影响;微观试验显示橡胶灰分为不规则的蜂窝状多孔结构,可吸附沥青并在其中均匀分布.

In order to analyze the performance of tire rubber ash(TRA)modified asphalt, the TRA was prepared by high temperature thermal decomposition and two kinds of matrix asphalt with different ash content(0%-5.0%) were used to prepare the TRA modified asphalt in this experiment.The three index of asphalt,dynamic shear rheometer (DSR), penetration index, viscosity, elastic recovery, thin film oven test (TFOT) and standard test method for separation were carried out to study the high temperature characteristics, low temperature performance, temperature sensitivity, viscosity temperature properties, elastic recovery, aging properties and storage stability of TRA modified asphalt.And scanning electron microscopy and fluorescence microscopy were applied to analyze the microstructure of TRA and the modification effect of the modified asphalt.The results show that the high temperature performance of asphalt with TRA can be significantly improved, which can also reduce the temperature sensitivity and improve the viscosity temperature performance;when the content of TRA is lower than 3.0%, the elastic recovery of asphalt is improved significantly, and the TRA modified asphalt has no significant effect on the low temperature performance, aging properties and storage stability.Therefore, the advisable addition of TRA is 3.0%.Meanwhile, the microscopic test show that the TRA particles are irregular honeycomb structure with sticky pores, which can adsorb asphalt and evenly distribute in the asphalt.