聚合物改性沥青高温抗变形特性实验研究

发布时间：2018-08-26 19:43

【摘要】：为研究短期老化作用、温度分别对3种聚合物改性沥青:SBS改性沥青(SMA)、橡胶粉改性沥青(RPMA)、复合改性沥青(CMA)抗变形能力的影响,利用动态剪切流变仪(DSR)分别对3种沥青原样及旋转薄膜烘箱老化(RTFOT)后的沥青试样进行重复蠕变恢复实验,利用抗变形指数HL与蠕变劲度的粘性部分GV对沥青高温变形性能进行评价;并利用扫描电子显微镜对各沥青试样的微观结构形态进行观察,从微观角度解释不同沥青抗变形能力存在差异的原因。结果表明,GV与HL可较好地评价高温下改性沥青的抗变形能力;短期老化作用使基质沥青与改性剂的微观结构发生变化,抗变形性能改变;温度对沥青抗变形能力的影响取决于沥青温度敏感性的强弱,RPMA在高温状态下表现最好。
[Abstract]:In order to study the short term aging effect, the effect of temperature on the deformability of three kinds of polymer modified asphalt (SMA), rubber powder modified asphalt (RPMA), composite modified asphalt (CMA) was studied. Using dynamic shear rheometer (DSR), the repeated creep recovery experiments were carried out on the asphalt samples of three kinds of asphalt samples and the aged (RTFOT) samples of rotating film oven, respectively. The deformation resistance index (HL) and the viscous part of creep stiffness (GV) were used to evaluate the deformation performance of asphalt at high temperature, and the microstructure and morphology of each asphalt sample were observed by scanning electron microscope (SEM). This paper explains the reason why the deformation resistance of different asphalt is different from the microscopic point of view. The results show that GV and HL can be used to evaluate the deformation resistance of modified asphalt at high temperature, and the microstructure and deformation resistance of matrix asphalt and modifier can be changed by short-term aging. The effect of temperature on the deformation resistance of asphalt depends on the temperature sensitivity of asphalt RPMA is the best in high temperature state.
【作者单位】：内蒙古工业大学土木工程学院;
【基金】：国家自然科学基金资助项目(11162012)
【分类号】：U414

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