FTIR and rheology analysis of aging on different ultraviolet absorber modified bitumens
FTIR and rheology analysis of aging on different ultraviolet absorber modified bitumens
复制标题
不同紫外线吸收剂改性沥青老化的 FTIR 和流变学分析
DOI：
10.1016/j.conbuildmat.2016.04.040
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发表时间：
2016-07-15
影响因子：
7.4
通讯作者：
Li, Xin-jun
中科院分区：
文献类型：
--
作者：
Feng, Zhen-gang;Wang, Shu-juan;Li, Xin-jun
使用三种不同的紫外线吸收剂（UVA），包括辛苯酮、布美曲唑和tinuvin770，对道路沥青进行改性。基础沥青和 UVA 改性沥青通过薄膜烘箱试验 (TFOT)、加压老化容器 (PAV) 和紫外线 (UV) 老化进行老化。应用傅里叶变换红外 (FTIR) 光谱研究 UVA 改性沥青的化学结构。基于 FTIR 结果定义了几个结构指标来评估粘合剂的老化程度。最后，测试了 UVA 改性沥青的流变特性，以证实 FTIR 分析的有效性。结果表明，UVA对沥青的支化脂肪族结构影响不大，但增加了沥青的芳香族结构。三种UVA可以抑制沥青的热氧化和光氧化老化，因为老化过程中UVA减缓了沥青的断链、缩聚和氧化反应。在三种 UVA 中，tinuvin770 对沥青的耐热和光氧化老化性能表现出最显着的改善。 (c) 2016 Elsevier Ltd. 保留所有权利。
Three different kinds of ultraviolet absorbers (UVAs), including octabenzone, bumetrizole and tinuvin770, were used to modify the road bitumen. The base and UVA modified bitumens were aged by the thin film oven test (TFOT), pressurized aging vessel (PAV) and ultraviolet (UV) aging. The Fourier transform infrared (FTIR) spectroscopy was applied to investigate the chemical structures of the UVA modified bitumens. Several structural indexes based on the FTIR results were defined to evaluate the aging extent of the binders. Finally, the rheological properties of the UVA modified bitumens were tested in order to confirm the validity of the FTIR analysis. Results show that the UVAs have little influence on the branched aliphatic structure of bitumen, but increase the aromatic structure of bitumen. The thermal and photo-oxidative aging of the bitumen can be restrained by the three UVAs since the reactions of chain scission, polycondensation and oxidation of the bitumen are slowed down by the UVAs during aging. Among the three UVAs, the tinuvin770 exhibits the most significant improvement on the thermal- and photo-oxidative aging resistance of bitumen. (c) 2016 Elsevier Ltd. All rights reserved.