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采用动态剪切流变和弯曲梁流变试验,研究了胶粉复配RET改性沥青短、长期老化前后的高、低温流变特性,并与SBS复配RET改性沥青进行了对比。通过原子力显微镜对胶粉复配RET、SBS复配RET改性沥青老化前后的改性机理进行了初步分析。结果表明:胶粉、RET的掺入能改善沥青老化前后的高温性能;相比于SBS复配RET改性沥青,胶粉复配RET改性对短期老化前后沥青的高温性能改善更显著,且长期老化后其劲度模量增长幅度更低;随着RET掺量的增加,胶粉、SBS复配RET改性沥青老化前后的高温抗变形能力随之增强,其低温性能变化不大;胶粉复配RET改性沥青的微观形态中出现明显的“黑白斑点”结构,相较于SBS复配RET改性沥青,胶粉复配RET改性沥青老化后的粘结力与耗散能显著提高,弹性模量降低,其抗老化性能更好。
The dynamic shear rheology and bending beam rheological tests were used to study the rheological properties of high and low temperature before and after the rubber powder compounding with RET modified bitumen. The results were compared with that of SBS compound with RET modified bitumen. The atomic force microscope (SEM) was used to analyze the modification mechanism of RET and SBS mixed with RET modified asphalt before and after aging. The results show that the addition of rubber powder and RET can improve the high temperature performance of asphalt before and after aging. Compared with SBS compound with RET modified asphalt, the rubber compound with RET modification can improve the high temperature performance of asphalt even more significantly With the increase of RET content, the high temperature deformation resistance of rubber powder and SBS compound RET modified asphalt before and after aging is enhanced, while the low temperature performance does not change much. Compared with SBS with RET modified asphalt, the adhesion and dissipation of rubber compound with RET modified asphalt after aging were obvious Improve, reduce the elastic modulus, the anti-aging properties better.