多聚磷酸改性沥青研究现状及展望

摘要

In order to clarify the status quo of polyphosphoric-acid (PPA)-modified asphalt,the modified mechanisms of PPA on the aspects are systematically elucidated.The preparation processes of PPA modified asphalt are summarized,the effect laws of PPA on the pavement performance of asphalt binders are investigated,and the development directions of PPA modified asphalt are discussed.The shortcomings of previous researches on modified mechanism and preparation technology are the two main factors which restrict the application of PPA modified asphalt in China.The addition of PPA to asphalt can effectively improve the high tem perature performance and anti-aging ability,while the impact of PPA on the moisture susceptibility of asphalt depends on many factors,for instance,the source of aggregates and asphalts.Nevertheless,the effect of PPA on the low temperature performance and fatigue resistance of asphalt has no final conclusions.%为明确多聚磷酸(PPA)改性沥青的研究现状,系统阐述了PPA对沥青的改性机理,归纳了PPA改性沥青的制备工艺,重点梳理了PPA对沥青路用性能的影响规律,论述了PPA改性沥青未来研究的发展方向.分析结果表明:PPA改性沥青的作用机理和制备工艺研究不足是制约其在我国推广使用的重要原因;PPA的添加能明显改善沥青的高温性能和抗老化性能,其对沥青水稳定性的影响取决于集料和沥青类型等多方面因素,而PPA改性沥青的低温性能和疲劳特性目前尚无定论,有待进一步研究.