基于热质联用技术的塔河道路沥青性能分析

Property analysis of Tahe road asphalt using simultaneous thermog-ravimetry-differential scanning calorimetry-mass spectrometry

为深入分析沥青微观结构、热性质与沥青路用性能之间的关系,采用热重-差热分析-质谱联用技术研究了3种塔河沥青在30℃～550℃范围内升温时的热重与吸热性质,检测了沥青挥发与热分解的小分子产物,并分析了微观结构与沥青路用性能的关系。研究结果表明:挥发与热分解产物中质荷比为60以下的物质中主要有H2O、H2、C2H4(或CO)和OH基离子团,塔河沥青热重曲线从240℃左右开始有明显的失重现象,其宏观性能的改善,在微观上表现为烃类分解放热量的增加和分解残留质量比的降低。

In order to investigate the relation among the microstructure, thermal property and road performance of asphalt, three asphalts refined from Tahe rude oil were studied by using simultaneous thermogravimetry-differential scanning calorimetry-mass spectrometry （TG-DSC- MS）, the volatilizations, pyrolysis behaviors and thermal properties of three asphalts were studied from 30 ℃ to 550℃, and the relation between asphalt microstructure and road performance was analyzed. Analysis result indicates that asphalt productions in volatilization and thermal decomposition courses are mainly H2O.H2 .C2H4 （or CO）and ionic groupion（OH） when its mass-to-charge ratio is below 60, there is an obvious trend of weight loss from 240 ℃ in Tahe asphalt＇s thermogravimetric curve, and the improvement of asphalt performance is related to the increase of pyrolysis caloric and the decrease of residue mass. 4 tabs, 4 figs, 11 refs.