硫磺改性沥青的热结晶及微观形态分析

Analysis on the Heat Crystallization and Microstructure of Sulfur Modified Asphalt

为研究硫磺改性沥青的微观作用机理及其对于沥青混合料宏观性能的影响规律,采用差示扫描量热仪DSC和光学显微镜两种方法进行硫磺改性沥青进行微观分析,探究了不同掺量下硫磺在沥青胶结料和沥青混合料中的微观存在形态及其变化规律:当硫磺在沥青胶结料中的比例小于10%时,硫磺可以均匀的溶解和分散在沥青中,不会随时间的变化而出现聚集或结晶的现象;当硫磺在沥青胶结料中的比例介于10%〜20%之间时,硫磺开始发生聚集现象,随着时间延长硫磺逐渐形成放射状的聚集形态和结晶现象;当硫磺在胶结料中的比例介于20%〜40%之间时,约15%的硫磺在沥青中将会均匀溶解和聚集现象,剩下的硫磺均以结晶的形态存在。

In order to study the sulfur modified asphalt micro-mechanism and relative effect law to the asphalt mixture macroscopic performance,two test method including DSC and optical microscope are used in surfur modified asphalt microcosmic analysis.The microscopic state and variation trend of sulfur existence in the asphalt binder and asphalt mixture with different sulfur dosage are explored in this paper.When the sulfur dosage is below 10% in the asphalt binder,sulfur can be solved and dispersed uniformly.When the sulfur dosage is between 10-20% in the asphalt binder,the sulfur aggregation phenomenon will take place,and that sulfur will grow up into radial aggregation phase and crystalline phase gradually.When the sulfur dosage is between 20-40% in the asphalt binder,about 15% sulfur can be solved and dispersed uniformly and remaining sulfur in its crystalline state phase.