基于DSR直接拉伸试验的沥青高温粘聚性分析  

Modified Asphalt Cohesion Based on Tensile Test of DSR

作　　者：马晓燕 陈华鑫[1,2] 邢明亮[1,2] MA Xiaoyan, CHEN Huaxin, XING Mingliang(1. School of Material Science and Engineering, Chang＇an university, Xi＇an 710061, China; 2. Engineering Research Center of Transportation Material, Ministry of Education, Chang＇ an University, Xi＇ an 710061, Chin)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710061 [2]长安大学交通铺面材料教育部工程研究中心,陕西西安710061

出　　处：《材料科学与工程学报》2018年第2期223-228,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51608045);中国博士后科学基金资助项目(2015M582592);中央高校基本科研业务费专项资金资助项目(310831153409;310831153315;310831161010);青海省科技资助项目(2014-GX-A2A)

摘　　要：采用动态剪切流变仪(DSR)直接拉伸试验研究了60℃时改性沥青老化(RTFOT)前、后的粘聚性。绘制了σ-ε关系曲线,并对曲线进行双指数拟合;采用应力峰值σmax、峰值对应位移ε0、拉力功W以及指数方程拟合参数A1、A2作为沥青高温粘聚性的评价指标。研究结果表明:老化前TPS高粘沥青粘聚性各项指标最优;改性剂来源不同、掺量相同的SBS改性沥青粘聚性差异较大,其中以791改性沥青粘聚性最好,1301次之,4303最差。橡胶粉/791SBS复合改性沥青的σmax、ε0、W以及拟合参数A1、A2均远小于791改性沥青;RTFOT老化后,改性沥青粘聚性发生了较大变化,1301改性沥青各项指标最优、其次为4303,TPS高粘沥青和791改性沥青的粘聚性较差,橡胶沥青的粘聚性远小于其它类型改性沥青。Cohesion of different modified asphalts were investigated before and after rotated thin film oven tests（RTFOT）by direct tensile test of dynamic shear rheology（DSR）.σ-εcurve was fitted by double exponential,choosing peak stressσmax,peak displacementε0,pulling power W,fitting parameters A1,A2 as evaluation indexes.The results indicate that tough polystyrene（TPS）high viscosity asphalt has the best cohesion performance,three kinds of styrene butadiene styrene（SBS）modified asphalt with the same content but different modifiers have great discrepancy on cohesion：σmax、ε0、W 、A1and A2 of crumb/791 SBS modified asphalt were far less than those of 791 SBS modified asphalt.The results also indicate that cohesion of different asphalts change obviously after RTFOT,cohesion of TPS,791 modified asphalt decrease dramatically,but the1301 modified asphalt has a better performance than that before RTFOT and other kinds of asphalt.The crumb rubber asphalt has a poor cohesion performance compared with other asphalt,either before or after RTFOT.

关 键 词：道路工程 改性沥青 粘聚性 评价指标 

分 类 号：U414[交通运输工程—道路与铁道工程]