Effect of aging on morphology, rheology, and chemical properties of highly polymer modified asphalt binders
Effect of aging on morphology, rheology, and chemical properties of highly polymer modified asphalt binders
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老化对高聚物改性沥青结合料形态、流变学和化学性能的影响
DOI：
10.1016/j.conbuildmat.2021.122595
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发表时间：
2021-04
影响因子：
7.4
通讯作者：
Hao Gengren
中科院分区：
文献类型：
--
作者：
Tang Naipeng;Huang Weidong;Hao Gengren
提出了一种高分子改性沥青结合料（HPMBs），用于改善排水性沥青路面的抗剥落性能。然而，HPMB在使用中经历老化，这还没有从形态学、流变学和化学的角度得到很好的理解。本研究的主要目的是探讨不同配方的HPMB的老化机理。本文对七种不同SBS含量和硫含量的HPMB进行了RTFO（滚动薄膜烘箱）和PAV（加压老化容器）老化。采用荧光显微镜（FM）、动态剪切流变仪（DSR）、傅里叶变换红外光谱（FTIR）和凝胶渗透色谱（GPC）分别研究了短期和长期氧化老化对HPMB的形态、化学和流变性能的影响。结果表明，聚合物和硫磺均有助于改善HPMB的流变性能和耐老化性能。然而，过量的聚合物和硫磺并不一定更好。此外，使用GPC曲线和FTIR光谱来评估HPMB在老化过程中的化学性质变化存在潜在的偏差。对于未老化和老化的HPMB，在低频区域的平台区和相位角减小不能简单地归因于荧光图像中呈现的连续聚合物相。本研究的这些发现为HPMB的老化机制提供了新的见解。
The highly polymer modified asphalt binders (HPMBs) are proposed and used for improving raveling resistance of porous asphalt pavement. However, HPMBs undergo aging in service, which has not been well understood from the perspective of morphology, rheology, and chemistry. The main aim of this study is to investigate the aging mechanism of HPMBs with different formulations. In this article, seven HPMBs with different SBS and sulfur contents were subjected to RTFO (Rolling Thin Film Oven) and PAV (Pressurized Aging Vessel) aging. The effect of short-term and long-term oxidative aging on the morphological, chemical, and rheological properties of the HPMBs were analyzed using fluorescence microscopy (FM), dynamic shear rheometer (DSR), Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC), respectively. The results indicate that both polymer and sulfur are helpful in improving rheological properties and aging resistance of HPMBs. However, excessive polymer and sulfur are not necessarily better. Furthermore, there is a potential bias in using GPC curves and FTIR spectra to evaluate chemical properties changes of HPMBs during aging. For unaged and aged HPMBs, the plateau region and decreased phase angle at low frequencies region could not be simply attributed to the continuous polymer phase presented in fluorescent images. These findings from the present study offer insights into the aging mechanism of HPMBs.
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作者：
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通讯作者：
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