基于沥青微观形貌与流变性研究SBS改性对其老化的影响

发布时间：2018-06-19 19:47

本文选题：道路工程 + AFM形貌图　；参考：《石油学报(石油加工)》2017年03期

【摘要】：通过考察沥青的纳米微观形貌和流变性变化,探讨了SBS改性剂对沥青老化性能影响的微观机理。用原子力显微镜(AFM)测定SBS改性前后2种沥青的3种老化状态[原状、旋转薄膜烘箱老化(RTFOT)、RTFOT+压力容器老化(PAV)]的微观形貌变化。同时,利用旋转黏度计(RV)和动态剪切流变仪(DSR)测定了2种沥青在上述3种不同老化阶段的135℃旋转黏度、抗车辙因子和疲劳开裂因子。结果表明,加入SBS改性剂,在原状和RTFOT+PAV老化阶段,比相应的基质沥青增加了"蜂状结构"的"崎岖"程度,但在RTFOT老化阶段,"崎岖"程度则减轻;因老化而引起的"蜂状结构"数量的减少,与沥青黏度增加和抗车辙因子指标增大的趋势正相关;表征"蜂状结构"AFM因子中的面积差因子与沥青老化进程中旋转黏度和抗车辙因子指标呈现显著线性相关的关系。
[Abstract]:The microcosmic mechanism of the effect of SBS modifier on the aging properties of asphalt was investigated by investigating the changes in the microstructure and rheological properties of asphalt. The micromorphology of 2 kinds of bitumen (original, rotary film oven aging (RTFOT) and RTFOT+ pressure vessel aging (PAV)) were measured by atomic force microscopy (AFM). Rotation viscosity (RV) and dynamic shear rheometer (DSR) were used to determine the rotational viscosity, anti rutting factor and fatigue cracking factor of 2 kinds of asphalt at the 3 different aging stages. The results showed that adding SBS modifier to the original and RTFOT+PAV aging stages increased the "bumpy" degree of the "bee like structure" than the corresponding matrix bitumen. The "bumpy" degree decreased in the RTFOT aging stage, and the decrease in the number of "bee like structure" caused by aging was positively correlated with the increase of asphalt viscosity and the increase of anti rutting factor index, and the area difference factor in the characterization of the "bee like structure" AFM factor showed a significant linear phase with the rotation viscosity and the anti rutting factor index in the asphalt aging process. A close relationship.
【作者单位】：苏州科技大学道路工程研究中心;
【基金】：国家自然科学基金项目(51378328)资助
【分类号】：U414

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