沥青四组分和沥青的热失重分析

采用热失重分析仪(TGA)对沥青四组分及几种基质沥青进行非等温热失重分析,研究表明,饱和分、芳香分、胶质、沥青质开始迅速分解时的温度分别为300℃,412℃,438℃,472℃;含饱和分较多的沥青分解温度较低。在沥青进行改性及储存的施工温度为160℃~180℃时对饱和分及芳香分进行等温热失重分析,研究表明,在160℃~180℃饱和分和芳香分会产生较大的损耗,饱和分和芳香分在180℃恒温3 h的质量损失为160℃的3倍左右;不同产地的沥青由于饱和分和芳香分含量的差异其损耗程度不相同;热储存中,饱和分含量低的沥青在较短时间内质量损失趋于稳定,饱和分含量高的沥青随着储存时间延长质量损失仍较严重。

Thermo Gravimetric Analysis on Four Fractions of Asphalt and Base Asphalt

The non-isothermal process of four fractions of asphalt and several base asphalt is studied by TGA,and the results show that the sharp decomposition temperature of saturates,aromatic,resins and asphaltenes is 300℃,412℃,438℃,472℃ respectively;the decomposition temperature of asphalt with more saturates content is lower.The isothermal gravimetric analysis on saturates and aromatics is carried out when the construction temperature of modifying and storing the asphalt is 160℃～180℃.The study shows that saturates and aromatics will loose a large amount of weight during the storage at 160℃～180℃.The loss weight of saturate and aromatic is almost three times more during storage at 180℃than that at 160℃.The asphalt from different places has different weight loss because the contents of saturate and aromatic in each kind of asphalt are different.During thermal storage,the weight loss of asphalt with lower saturate tends to be stable in a short time and the weight loss of asphalt with higher saturate is more severe with the time passing by.