SBS改性与SBR改性微表处体系差异及机理研究

Study on System Difference and Mechanism of SBS Modification and SBR Modification Micro-surfacing

乳化沥青改性方式对微表处混合料早期成型影响较大。为明确SBS改性、SBR改性等两类乳化沥青改性体系对微表处的性能影响,选取各地代表性原材料,从乳化沥青制备、混合料性能及乳化沥青试验等方面对两类体系进行全面对比,据此深入分析两类体系的改性乳化机理。结果表明:两类微表处体系稠度稍显区别且差异并不显著,SBS体系的稠度略低于SBR体系;SBS体系的混合料早期强度低于SBR体系,且SBS体系的混合料内聚力提高幅度远大于SBR体系;石料与乳化沥青配伍性对稀浆混合料的拌和工艺及性能影响远大于两种体系差异带来的影响。

Modified ways of emulsified asphalt played an important influence on the early forming of microsurface mixture.In order to clarify the influence of SBS modification,SBR modification and other two emulsified asphalt modification systems on the performance of the microsurface,representative raw materials were selected to make a comprehensive comparison between the two systems from the aspects of emulsified asphalt mixture preparation performance and emulsified asphalt test,the modified emulsification mechanism of the two systems was analyzed based on this.The results showed that the consistency of the two microtables was slightly different and the difference was not significant.The consistency of SBS system was slightly lower than SBR system;Early strength of SBS modified mixture was lower than SBR modified mixture,Improvement of mixture cohesion for SBS modified mixture was much higher that SBR modified mixture;The compatibility of stone and emulsified asphalt has much more influence on the mixing process and performance of dilute slurry mixture than the difference between the two systems.