聚合物改性沥青细观结构及高温性能试验研究

发布时间：2018-06-04 18:47

本文选题：聚合物改性沥青 + 细观结构　；参考：《公路工程》2014年05期

【摘要】：针对包括内蒙古在内的西部地区常用的3种聚合物改性沥青(胶粉改性沥青、SBS改性沥青及复合胶粉改性沥青),利用扫描电镜(SEM)对比观察了废胶粉和SBS改性剂、普通沥青及3种改性沥青的微观结构形貌,发现两种改性剂均具有网状结构,3种改性沥青中橡胶粉及SBS改性剂都与沥青融合性良好;利用针入度粘度指数PVN和粘温指数VTS对3种改性沥青的感温性进行了评价,发现胶粉改性沥青具有最小的温度敏感性;利用动态剪切流变试验,通过研究复数剪切模量G*及相位角δ随温度及频率变化的规律并利用改进的车辙因子对3种改性沥青的高温性能进行评价,得出胶粉改性沥青具有最好的高温稳定性,其次为复合胶粉改性沥青,并且从改性沥青微观结构的角度出发解释了3种改性沥青温度敏感性与高温变形性能存在此种规律的原因。
[Abstract]:In this paper, three kinds of polymer modified asphalt (rubber powder modified asphalt, SBS modified asphalt and compound rubber powder modified asphalt), which are commonly used in western region including Inner Mongolia, are compared and observed with scanning electron microscope (SEM), and the waste rubber powder and SBS modifier are compared and observed. The microstructure and morphology of ordinary asphalt and three kinds of modified asphalt show that the rubber powder and SBS modifier of the three kinds of modified asphalt have good blending property with asphalt. The temperature sensitivity of three kinds of modified asphalt was evaluated by penetration viscosity index (PVN) and viscosity temperature index (VTS). By studying the variation of complex shear modulus G * and phase angle 未 with temperature and frequency, and using the improved rutting factor to evaluate the high temperature performance of three kinds of modified asphalt, it is concluded that rubber powder modified asphalt has the best high temperature stability. Secondly, the asphalt modified by compound rubber powder is introduced, and the reason of temperature sensitivity and high temperature deformation property of three kinds of modified asphalt is explained from the point of view of the microstructure of modified asphalt.
【作者单位】：内蒙古工业大学土木工程学院;
【基金】：国家自然科学基金项目(11162012)
【分类号】：U414

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