基于复合改性的有砟轨道沥青基材料优化

Optimization of ballasted track asphalt base material based on composite modification

为提升有砟轨道封闭层沥青基材料的综合性能,采用废旧橡胶粉和再生PE对沥青进行复合改性,通过三大指标试验、弯曲梁流变仪试验和动态剪切流变试验进行分析。结果表明:复合改性沥青基材料具有良好的高低温性能,推荐采用6%再生PE-11%再生胶粉、7%再生PE-15%再生胶粉的两种配比组合对沥青进行复合改性。

In order to improve the comprehensive performance of asphalt-based materials with ballasted track closure layer,this paper uses waste rubber powder and recycled PE to compound modification of asphalt,and through three major index tests,bending beam rheometer tests and dynamic shear rheological tests.the results show that the composite modified asphalt-based materials developed have good high and low temperature properties,and it is recommended to use two combinations of 6%recycled PE-11%recycled rubber powder and 7%recycled PE-15%recycled rubber powder to compound the asphalt.