摘要
利用傅里叶红外光谱仪(IR)、原子力显微镜(AFM)与动态剪切流变仪(DSR)对多聚磷酸(PPA)、苯乙烯-丁二烯-苯乙烯(SBS)、PPA&SBS改性的三种沥青和基质沥青进行了表征测试。结果表明:PPA加入到基质沥青中会生成新的酯类化合物,PPA及PPA&SBS改性沥青均在800~1000cm-1波段出现了新的混合吸收峰,说明PPA与基质沥青、SBS改性沥青均发生了新的化学反应;通过AFM观察PPA、SBS、PPA&SBS改性沥青的三维形貌图可以发现,三种改性沥青表面比基质沥青要粗糙、崎岖,其中PPA&SBS改性沥青表面最粗糙。同时PPA改性沥青与PPA&SBS改性沥青的峰区高于基质沥青与SBS改性沥青,三种改性沥青峰区数量均较基质沥青多。通过均方根粗糙度Rq、峰密度指数Sds、表面承载系数Sbi三个指标对四种沥青的AFM三维形貌图观测结果进行了验证,验证结果表明PPA&SBS改性沥青具有最大硬度,DSR结果也表明其具有较好的高温抗变形能力;通过层次分析法(AHP)对评价四种沥青表面粗糙程度的三个指标进行了对比,发现表面承载系数Sbi具有最大权重0.5714,建议在利用AFM表征沥青表面粗糙程度时,使用Sbi更加真实、确切。
Four asphalts of pure asphalt,polyphosphate (PPA),styrene-butadiene-styrene (SBS) and PPA & SBS were characterized by Fourier transform infrared spectroscopy (IR),atomic force microscopy (AFM) and DSR.The results show that PPA is added to the Pure asphalt to form new ester compounds,both PPA and PPA compound SBS modified asphalt have new mixed absorption peaks in the 800-1 000 cm -1 band,explain that a new chemical reaction has occurred between PPA and pure asphalt and SBS modified asphalt. By observing the AFM three-dimensional topography,it can be found that the surface of PPA,SBS and PPA compounded SBS modified asphalt is rougher and more rugged than the pure asphalt,and the surface of PPA compounded SBS modified asphalt is the roughest.At the same time,the peak area of PPA modified asphalt and PPA compounded SBS modified asphalt is higher than pure asphalt and SBS modified asphalt,the number of three modified asphalt peaks area is higher than that of the pure asphalt,the observation results of AFM three-dimensional topography were verified by three indexes: root mean square roughness R q,peak honeyness index S ds and surface bearing index S bi . The verification results also show that the PPA compounded SBS modified asphalt has the maximum hardness,DSR results also show that it has good high temperature deformation resistance.The analytic hierarchy process (AHP) was used to compare the three indicators for evaluating the surface roughness of asphalt. It was found that the surface bearing index S bi has a maximum weight of 0.571 4,it is suggested that when using AFM to characterize the roughness of asphalt surface, Sbi is more real and accurate.
作者
王岚
崔世超
任敏达
WANG Lan;CUI Shichao;REN Minda(School of Civil Engineering,Inner Mongolia University of Technology,Huhhot 010051;School of Transportation Engineering,Tongji University,Shanghai 201804)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2019年第24期4105-4110,共6页
Materials Reports
基金
国家自然科学基金(11762012)
内蒙古交通科技项目(NJ-2014-9)~~
