微观指标对沥青热稳定性能的影响

沥青在存储、运输、拌和、施工及长期使用过程中,会发生挥发、氧化、聚合以及沥青内部结构产生变化等反应,影响沥青的性能和沥青混合料路面的使用性能及寿命。采用GPC（凝胶过滤色谱）分析、NMR（磁共振波谱）分析和XRD（X射线衍射）分析的试验方法,对3种石油沥青老化前后试样进行了研究分析。结果表明：沥青的热稳定性能可以通过沥青中的相对分子质量分布状况、取代甲基或亚甲基的相对含量、同一区域内的主要共掁峰的位置和相对强度、DSC曲线的吸热峰、饱和烃含量及其结晶度得到较为明显的体现。

Influence of microcosmic index on thermal stability performance of asphalt

The asphalt as the binders of the asphalt mixture,its evaporation,oxidation,polymerization,changes in the internal structure of asphalt and other reactions can change the nature of asphalt and the performance of asphalt mixture,and influence the life of pavement during the storage,transport,mixing,construction and long-term use.The GPC(gel permeation chromatography) analysis,the NMR(nuclear magnetic resonance) analysis,the XRD(X-ray diffraction)were carried out to study three kinds of petroleum asphalt before and after their aging.The results show that the thermal stability of asphalt can be adjusted by the changes of the relative molecular mass distribution situation,the relative content of methylene,the same area of main peak positions and similar strength,the absorption peaks of DSC curve,the content of saturated hydrocarbon and crystallinity.