胶粉/废机油复合改性沥青的制备及高温流变性能优化

Preparation and High-temperature Rheology Performance Optimization of Rubber Powder/Waste Engine Oil Composite Modified Asphalt

研究主要目的是将胶粉和废机油这两种汽车工业废料用于道路工程中,开发一种可持续环保的沥青胶结料。首先,采用中心组合设计方法进行试验设计,确定制备胶粉/废机油复合改性沥青制备参数;其次,开展旋转黏度、动态剪切流变试验、多重应力蠕变试验评价不同制备工艺条件下复合改性沥青高温流变性能。结果表明在胶粉改性沥青中掺入5%~10%废机油有利于增加胶粉改性沥青的流动性。采用中心组合设计方法确定的废机油掺量、拌合温度、拌合时间最佳参数分别为5%、160℃、20 min。与胶粉改性沥青相比,优化后复合改性沥青的黏度降低了27.1%,其流动性和可泵性提高。与基质沥青相比,优化后复合改性沥青的58℃未老化车辙因子和老化车辙因子均高出了约54%。

The main purpose of this research is to use rubber powder and waste engine oil in road engineering,two kinds of automobile industrial waste,to develop a sustainable and environmentally asphalt binder.Firstly,the central composite design method is used to conduct test design,and determine the preparation parameters of rubber powder/waste engine oil composite modified asphalt.Secondly,the rotational viscosity,dynamic shear rheological tests,and multiple stress creep tests were conducted to evaluate the high-temperature rheological properties of composite modified asphalt under different preparation process conditions.The results indicate that adding 5%~10%waste engine oil to rubber powder modified asphalt is beneficial for increasing the workability of rubber powder modified asphalt.The optimal parameters for determining the content of waste engine oil,mixing temperature,and mixing temperature using the central combination design method are 5%,160℃,and 20 minutes,respectively.Compared with rubber powder modified asphalt,the viscosity of the optimized composite modified asphalt decreased by 27.1%,and its workability and pumpability are improved.Compared with the neat asphalt,the optimized composite modified asphalt has an approximately 54%increase in both the unaged and aged rutting factors at 58℃.