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Chemical analysis of surface and bulk of asphalt binders aged with accelerated weathering tester and standard aging methods

机译：用加速老化试验仪和标准老化方法老化的沥青粘合剂的表面和体积化学分析

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This paper presents analysis of chemical changes in asphalt binder samples that were aged using an accelerated weathering tester, which involves UV radiation and direct aging of the binder surface. It also provides a comparison with chemical changes in the same binders but aged with standard methods. Fourier Transform Infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results show that the accelerated weathering tester caused more extensive chemical changes, such as higher oxidation and inclusion of nitrogen from the air, compared to standard aging methods. The amount of oxygen, nitrogen and sulfur on the surface was observed to increase as aging time increased. In addition, the XPS etching analysis highlighted that the depth profile of binders changed from the surface to deeper layers and showed that the directly aged samples using the weathering tester were heavily oxidized on the surface and less on the underlying layers. Unaged binders and binders aged with standard methods displayed a fairly uniform depth profile. However, slight differences in the chemical composition were detected on the surface of these samples, which were associated with the surface microstructure developed during sample preparation. The results of the chemical characterization are compared in this paper with previous findings in terms of microstructural configuration that were obtained using Atomic Force Microscopy (AFM). (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文介绍了使用加速老化测试仪老化的沥青粘合剂样品的化学变化分析，其中涉及紫外线辐射和粘合剂表面的直接老化。它还提供了对相同粘合剂但采用标准方法老化的化学变化的比较。傅立叶变换红外（FTIR）和X射线光电子能谱（XPS）结果表明，与标准老化方法相比，加速老化测试仪引起了更广泛的化学变化，例如更高的氧化和空气中氮的含量。观察到表面上的氧，氮和硫的量随着老化时间的增加而增加。此外，XPS蚀刻分析突出显示了粘合剂的深度分布从表面到更深的层变化，并显示了使用耐候性测试仪直接老化的样品在表面上被严重氧化，而在下层上的氧化较少。未老化的粘合剂和用标准方法老化的粘合剂显示出相当均匀的深度分布。但是，在这些样品的表面检测到化学成分的细微差异，这与样品制备过程中形成的表面微观结构有关。在本文中，将化学表征的结果与使用原子力显微镜（AFM）获得的微观结构方面的先前发现进行了比较。 （C）2017 Elsevier Ltd.保留所有权利。

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