煤沥青和石油沥青共混改性的研究进展

Research progress on blending modification of coal tar pitch and petroleum asphalt

煤焦油沥青(简称煤沥青)具有良好的路用性能,可以替代部分石油沥青,降低对外来沥青的依赖,提高煤沥青的资源化利用,但是煤沥青中存在大量毒性多环芳烃(PAHs),限制了它的广泛应用。本文介绍了煤沥青和石油沥青二者共混的改性方法,并对其进行了系统总结,通过对比现有改性沥青的研究,发现当前的改性手段主要以化学方法为主,改性效果最佳,得出改性过程的主要局限在于如何抑制煤沥青中PAHs的毒性,减少对环境的危害;同时分析并阐释了共混改性沥青可能的物理和化学改性过程及作用机理,对下一步的研究方向和发展进行了展望,提出从物理增容剂的开发和化学催化剂的筛选来做进一步的研究,希望为国内外的沥青改性提供一定的借鉴参考。

Coal tar pitch(CTP)has good road performance,which can be used to replace part of the petroleum asphalt to reduce the dependence on imported asphalt and improve the utilization rate of CTP.However,there are large amounts of toxic polycyclic aromatic hydrocarbons(PAHs)in CTP,which limited its extensively usage.The blending modification methods of CTP and petroleum asphalt were introduced and systematically summarized in this paper.It was found that the current modification methods were mainly based on chemical modification,showing the best modification effect.The main limitation of the modification blending process was how to suppress the toxicity of PAHs in CTP and reduce the harm to the environment.At the same time,the possible physical and chemical modification processes and mechanism of blending and modification CPT and asphalt were analyzed and explained.Next research direction and development were prospected from development of physical capacitors and screening of chemical catalysts,hoping to provide some reference for the modification of asphalt at home and abroad.