UV aging behavior and mechanism of cold-mixed epoxy asphalt

IF 3.8 4区工程技术 Q2 CHEMISTRY, APPLIED Journal of Vinyl & Additive Technology Pub Date : 2023-09-13 DOI:10.1002/vnl.22050

Ziqi Jiang, Jingjing Si, Mingzhen Zhang, Junyan Wang, Xiaoyang Shao, Miaomiao Xing, Xin Yu

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Abstract

In environmental conditions, the ultraviolet (UV) light from sunshine will trigger epoxy asphalt (EA) paving materials aging and performance reduction. This work studied the influence of UV aging on the structure and mechanical performance of cold-mixed epoxy asphalt (CEA) to evaluate its aging mechanism. The chemical structure of CEA was tested by Fourier transform infrared spectra, X-ray photoelectron spectroscopy, and micromorphology was observed through fluorescence microscopy. The mechanical properties of CEA were studied by tensile tests and dynamic mechanical analysis. The results indicated that the toughness of CEA went down due to UV aging, and the elongation at break and glass transition temperature decreased by 35.5% and 6.0°C, respectively. Based on structural analysis, the UV aging mechanism of CEA was summarized as follows: (1) the curing network of epoxy resin was partially broken, and the asphalt particle aggregated; (2) the asphalt and epoxy resin in UV aging-CEA were oxidized and formed carbonyl group and sulfonic group.

Highlights

Both asphalt and ER components in CEA underwent oxidation reactions and formed more CO, SO, and CO groups.
UV-CEA showed a decrease in toughness due to destruction of the cured ER cross-linked network and shortening of the asphalt molecular chain
E' and T_g of UV-CEA was decreased, resulting from a decrease in ER crosslink density and an increase in molecular chain segment mobility of ER and asphalt.

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冷拌环氧沥青的紫外线老化行为和机理

在环境条件下，阳光中的紫外线（UV）会引发环氧沥青（EA）铺路材料老化和性能下降。这项工作研究了紫外线老化对冷拌环氧沥青（CEA）结构和机械性能的影响，以评估其老化机理。通过傅立叶变换红外光谱和 X 射线光电子能谱测试了 CEA 的化学结构，并通过荧光显微镜观察了其微观形态。通过拉伸试验和动态力学分析研究了 CEA 的力学性能。结果表明，紫外老化导致 CEA 的韧性下降，断裂伸长率和玻璃化温度分别下降了 35.5% 和 6.0°C。根据结构分析，CEA 的紫外线老化机理归纳如下：(1）环氧树脂的固化网络被部分破坏，沥青颗粒聚集；（2）紫外线老化 CEA 中的沥青和环氧树脂被氧化，形成羰基和磺酸基。亮点 CEA 中的沥青和 ER 成分都发生了氧化反应，形成了更多的 CO、SO 和 CO 基团。 UV-CEA 的韧性下降，原因是固化的 ER 交联网络被破坏，沥青分子链 E' 缩短，UV-CEA 的 Tg 下降，原因是 ER 交联密度降低，ER 和沥青的分子链段移动性增加。

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来源期刊

Journal of Vinyl & Additive Technology 工程技术-材料科学：纺织

CiteScore

5.40

自引率

14.80%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Vinyl and Additive Technology is a peer-reviewed technical publication for new work in the fields of polymer modifiers and additives, vinyl polymers and selected review papers. Over half of all papers in JVAT are based on technology of additives and modifiers for all classes of polymers: thermoset polymers and both condensation and addition thermoplastics. Papers on vinyl technology include PVC additives.