摘要
采用金属制小盛样皿浇注成型制备显微观测样本,在荧光显微镜100倍放大倍数下,观测实验室新制备SBS改性沥青、室温存放2个月的SBS改性沥青及不同厂家提供的成品SBS改性沥青显微相态。观测结果表明：在荧光显微镜下,改性剂的分布形态清晰可见,并且SBS掺量为4%~5%时,微观上可以达到两相连续的最佳共混状态;随着存放时间的延长,当SBS掺量大于3%时,改性沥青网状结构逐渐形成,这种网状结构会由于SBS改性剂吸附沥青分子中的油分充分溶胀、发育及分散到沥青中,基质沥青的组分发生重组,从而形成共混体系的空间网状结构。对于不同厂家的成品改性沥青,由于加工工艺和相容性等原因,微观相态存在明显的＂聚结＂现象,也就是宏观性能表现的＂离析＂现象。
The microscopic observation sample is prepared by casting molding with a small dish containing softening point ring.Three types of SBS modified bitumen were observed by FM with 100＊magnification.These three types of samples are as follows：The first one is produced by our lab,without storing,the second one is produced by our lab and kept at ambient temperature for 2months,and the third one is from other different factories.The results indicate that microscopic phase image is very clear,the SBS content is recommended between 4%~5%,which can be achieved on a two-phase continuous microstructure on the best blends.With the increase of the storage period,the network structure of SBS modified bitumen whose SBS content was larger than 3%is gradually formed,and this network structure was contributed to SBS modified bitumen molecules adsorbing oil,which is fully developed into swelling dispersion in the bitumen,and the component of the bitumen was reorganized,so a new space network structure is formed.For modified bitumen produced by other different factories due to the difference of the process and compatibility,the presence of the microscopic phase appears as＂coalescence＂phenomenon,and mainly appears as＂segregation＂on the macro performance.
出处
《交通科学与工程》
2014年第3期10-14,共5页
Journal of Transport Science and Engineering
关键词
SBS改性沥青
显微相态
网状结构
相容性
SBS modified bitumen
microscopic phase
network structure
compatibility
