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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。
During the storage, transportation, mixing, construction and long-term use of asphalt, the reaction of volatilization, oxidation and polymerization as well as the change of internal structure of asphalt occurs, affecting the performance of asphalt and the performance and service life of asphalt mixture pavement. The samples before and after the aging of three kinds of petroleum bitumen were studied by GPC (gel filtration chromatography) analysis, NMR (magnetic resonance spectroscopy) analysis and XRD (X-ray diffraction) analysis. The results show that the thermal stability of asphalt can be determined by the relative molecular mass distribution in asphalt, the relative content of substituted methyl or methylene, the location and relative intensity of major co-peaks in the same region, the endothermic peak of DSC curve , Saturated hydrocarbon content and crystallinity have been more obvious manifestation.