SBS改性沥青耐久性研究现状综述

Review on Research Status of SBS Modifi ed Asphalt Durability

基于国内学者对于SBS改性沥青耐久性的最新研究成果,总结归纳了在热氧、紫外光、水以及耦合条件下,SBS改性沥青的老化机理、性能变化及特性,并对今后的研究方向提出建议。结论如下:在上述几种条件下,SBS改性沥青的老化机理相似,均是由于其中的SBS聚合物老化和基质沥青老化两方面效应综合作用的结果;在上述几种条件下老化后的SBS改性沥青,三大性能指标变化一致,即针入度和延度降低,软化点升高。水的存在可促进SBS改性沥青的老化,并且随着水量增加,老化加剧。今后应加强对SBS改性沥青水老化和耦合老化的研究。

According to the latest research on the durability of SBS modified asphalt,this paper summarized the aging mechanism,performance changes and characteristics of SBS modified asphalt in conditions of thermal-oxidative,ultraviolet,water and coupling. The conclusions were as follows： in these conditions,the aging mechanism of SBS modified asphalt were similar,which were due to the combined effects of two aspects of SBS polymer aging and matrix asphalt aging;In these conditions,three performance indices had same trend after SBS modified asphalt aging,the penetration and ductility decrease,softening point increase;water would promote SBS modified asphalt aging,and the aging would be intensified as the amount of water increases;we should strengthen the research on water aging and coupling aging of SBS modified asphalt.