Physicochemical and pyrolysis properties of SARA fractions separated from asphalt binder
Physicochemical and pyrolysis properties of SARA fractions separated from asphalt binder
复制标题
从沥青结合料中分离出的 SARA 馏分的物理化学和热解特性
DOI：
10.1007/s10973-015-4700-3
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发表时间：
2015-10-01
影响因子：
4.4
通讯作者：
Wang, Lulu
中科院分区：
文献类型：
--
作者：
Zhang, Chaochao;Xu, Tao;Wang, Lulu
为了进一步了解沥青结合料的热性质，首先从沥青结合料中分离出饱和分、芳烃分、胶质分和沥青质分（SARA）。然后，对SARA馏分的理化性质和热解性质进行了表征。结果表明，沥青结合料中芳烃和胶质的含量高于饱和分和沥青质。从饱和分到沥青质，数均分子量呈现连续增加的趋势。饱和物和芳族化合物含有类似的键或官能团，并且芳族化合物含有比饱和物更少数量的饱和烃。此外，树脂和沥青质在傅里叶变换红外光谱（FTIR）光谱中显示出几个相似的透射峰。饱和烃、芳烃和沥青质的饱和烃含量高于胶质。此外，饱和物和芳烃的FTIR光谱与沥青结合料的FTIR光谱更相似。一些化学组成、化学键和官能团仅在SARA馏分的FTIR光谱中显示，通过这些光谱可以进一步了解沥青组分。此外，沥青结合料及其SARA组分的差热曲线均呈现出明显的单峰特征，表明其热解过程为一步反应。从饱和分到沥青质，渣油收率、起始分解温度、主要分解范围和最大失重速率依次增大。可以得出结论，每个SARA馏分的热稳定性依次增加饱和沥青质。
To further understand thermal properties of asphalt binder, four fractions, namely saturates, aromatics, resins and asphaltenes (SARA), were first separated from asphalt binder. Then, physicochemical and pyrolysis properties of SARA fractions were characterized. The results indicate that the contents of aromatics and resins in asphalt binder are higher than that of saturates and asphaltenes. The number-average molecular weights show a successive increase trend from saturates to asphaltenes. Saturates and aromatics contain similar bonds or functional groups, and aromatics contain a smaller number of saturated hydrocarbons than saturates. Also, resins and asphaltenes show several similar transmittance peaks in Fourier transform infrared spectroscopy (FTIR) spectra. Saturates, aromatics and asphaltenes contain more saturated hydrocarbons than that of resins. Further, FTIR spectra of saturates and aromatics are more similar to that of asphalt binder. Some chemical compositions, bonds and functional groups are only shown in FTIR spectra of SARA fractions through which asphalt components can be further understood. Furthermore, differential thermogravimetry curves of asphalt binder and its SARA fractions exhibit obvious unimodal characteristics, indicating that their pyrolysis processes are one-step reaction. The residue yield ratios, the temperatures corresponding to initial decomposition temperature, the main decomposition range and the maximum mass loss rate successively increase from saturates to asphaltenes. It is concluded that the thermal stability of each SARA fraction is successively increased from saturates to asphaltenes.