Observation and characterization of asphalt microstructure by atomic force microscopy  

基于原子力显微镜的沥青微观结构观察与表征(英文)

作　　者：杨军[1] 龚明辉 王潇婷[2] 陈先华[1] 王晓[1] 王征[1] 

机构地区：[1]东南大学交通学院,南京210096 [2]哈尔滨工业大学交通科学与工程学院,哈尔滨150090

出　　处：《Journal of Southeast University(English Edition)》2014年第3期353-357,共5页东南大学学报（英文版）

基　　金：The Ph.D.Programs Foundation of Ministry of Education of China(No.20120092110053)

摘　　要：The microstructure of asphalt is investigated by atomic force microscopy （AFM）. In order to analyze the impacts of asphalt types on microstructures, two neat asphalts with different penetration grades （50# and 70#） and one styrene-butadiene-styrene （SBS） modified asphalt are chosen. The influence of short-term aging is also studied. Based on the knowledge of asphalt＇s microproperties, the relationship between microstructures and healing property is analyzed. The results indicate that the microstructures of three asphalts are quite different and the effects of aging on the surface characteristics for different asphalts are also different. It is proposed that the bee structure is a type of wax crystal and it has a close relationship with the ＂bridge-healing＂ mechanism. The findings may reveal the formation mechanism of microstructure and the healing property for asphalts.利用原子力显微镜进行沥青微观结构的观察与表征.选用针入度分别为50#和70#的2种基质沥青及一种SBS改性沥青,分析沥青种类及短期老化对微观结构的影响.基于对微观特性的认识,讨论了沥青微观结构与自愈性能之间的联系.研究表明:对于不同沥青,其微观结构形态相差较大,且结构随老化而变化的规律也各不相同.初步推断观测到的蜂状结构是一种结晶体,其分子组成与已有研究观测到的"桥接"自愈现象关系密切.相关结论为沥青微观结构机理和自愈性能研究提供了新的思路.

关 键 词：ASPHALT atomic force microscopy （AFM） MICROSTRUCTURE self-healing property 

分 类 号：TU571[建筑科学—建筑技术科学]