聚合物改性沥青细观结构和重复蠕变特性研究

发布时间：2018-03-10 00:07

本文选题：聚合物改性沥青　切入点：细观结构　出处：《建筑材料学报》2014年04期 　论文类型：期刊论文

【摘要】：针对内蒙古等西北部地区常用的3种聚合物改性沥青(SBS改性沥青、胶粉改性沥青和复合胶粉改性沥青),利用扫描电子显微镜(SEM)观察它们的细观结构形貌,得到改性剂在沥青中的分布状态及其与沥青间的界面结合特性,发现3种改性沥青的改性剂与沥青间均具有良好的界面融合性.利用动态剪切流变仪(DSR)对3种改性沥青进行不同温度和荷载应力下的重复蠕变试验,通过对累积应变、蠕变劲度的黏性部分GV随荷载和温度变化规律的分析表明:3种改性沥青随加载次数、温度及应力大小变化的规律相同,但同样条件下胶粉改性沥青具有最低的温度敏感性、最小的累积应变和最大的GV值,说明其具有最好的抗高温变形性能,其次为复合胶粉改性沥青.
[Abstract]:Three kinds of polymer modified asphalt (SBS), rubber powder modified asphalt and compound rubber powder modified asphalt were used in northwestern Inner Mongolia to observe their meso-structure and morphology by means of scanning electron microscope (SEM). The distribution of modifier in asphalt and its interfacial binding with asphalt were obtained. It is found that there is good interfacial fusion between the modified asphalt and the modified asphalt. The repeated creep tests of the three modified asphalt under different temperature and load stress are carried out by using the dynamic shear rheometer (DSRs). The analysis of the viscosity part GV of creep stiffness with load and temperature shows that the change of temperature and stress of the three kinds of modified asphalt is the same, but the rubber powder modified asphalt has the lowest temperature sensitivity under the same condition. The minimum cumulative strain and the maximum GV value show that it has the best deformation resistance at high temperature followed by the modified asphalt with compound rubber powder.
【作者单位】：内蒙古工业大学土木工程学院;内蒙古工业大学理学院;
【基金】：国家自然科学基金资助项目(11162012)
【分类号】：U414

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