关于自然衰老和PAV衰老对青粘合剂的影响的研究,基于病学和微观结构组成
Fujin Hou1, Yunding Zhu2,3, Meng Guo2,3
1Shandong Hi-Speed Group Co., Ltd. Expressway Operation Center, Jinan 250098, China.
Materials (Basel, Switzerland)
|November 27, 2025
概括
实验室青老化 (PAV) 并不能完全模仿现实世界的条件. 自然老化对青粘合剂有很大的影响.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 化学工程是化学工程的重要组成部分.
背景情况:
- 实验室老化协议,如压力老化容器 (PAV),被广泛用于模拟青粘合剂的长期老化.
- 然而,实验室模拟的衰老可能无法准确地捕捉在各种环境条件下发生的复杂衰老机制.
- 了解自然和实验室老化之间的差异对于开发更可靠的青粘合剂性能预测模型至关重要.
研究的目的:
- 研究和分析天然老化 (热氧化和全天候) 和青粘合剂的PAV老化之间的差异.
- 系统地评估不同老化方法对青粘合剂性能的影响,包括低温性能,化学结构,元素组成和分子量.
- 关联宏观和微观性能变化,以确定主要的衰老驱动因素和途径.
主要方法:
- 青粘合剂样品经过了三种老化方法:PAV老化,天然热氧化老化和全天候老化.
- 进行了全面的分析,包括低温性能测试 (刚度模量),用于化学结构的里埃变换红外光谱 (FTIR),元素分析,用于分子重量分布的凝透色谱 (GPC).
- 在各种特性和老化条件之间进行了相关性分析.
主要成果:
- 在恶劣的寒冷和干旱环境中自然老化导致与PAV老化相比,低温性能明显差,硬度模量在-12°C时增加了100%以上.
- 自然老化诱导了比PAV老化更实质性的化学结构变化,但氧化和宏分子形成的明显程度较低.
- 热氧化条件被确定为自然和PAV衰老行为的主导因素,其他因素的影响最小.
- 在不同衰老模式中,在氧含量,分子量和低温性能之间观察到不良的相关性 (R2 < 0.62),突出了不同的衰老路径.
结论:
- 在实验室加速老化 (PAV) 和青粘合剂的自然老化之间存在显著差异,特别是在低温性能和化学演变方面.
- 自然衰老路径主要由热氧化条件驱动,与PAV衰老模拟的路径有所不同,对粘合剂特性产生不同的影响.
- 这些发现需要优化实验室老化协议,以更好地代表现实世界的老化现象,并提高青粘合剂性能预测的准确性.
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