复杂环境对疲劳和自我愈合的影响 含岩石青的青复合材料的特征
Ruixia Li1, Shangjun Yu1, Hailong Chen1
1School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China.
Materials (Basel, Switzerland)
|May 25, 2024
概括
岩石青延长了青路面的疲劳寿命,但减少了自我愈合. 环境老化 (紫外线,冷解) 降低了性能,但岩石青混合物显示出更好的弹性和抗老性.
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.
- 地质技术工程 地质技术工程
背景情况:
- 青路面面临着诸如紫外线老化和冷解周期等环境挑战,导致变形和裂.
- 岩石青是青粘合剂的有希望的修饰剂,增强了兼容性和疲劳裂纹耐受性.
- 关于环境老化和岩石青对路面疲劳和自我愈合的综合影响的研究有限.
研究的目的:
- 研究紫外线老化和冷解周期对用岩石青改性细聚合物矩阵 (FAM) 混合物的疲劳和自我愈合特性的影响.
- 评估含有Buton,Qingchuan (QC) 和Uintaite Modifier (UM) 的FAM混合物在复杂环境条件下的岩石青的性能.
- 了解由于老化和岩石青改性而导致的青粘合剂的微观结构变化和化学变化.
主要方法:
- 对FAM混合物与不同岩石青进行了联合疲劳愈合试验.
- 粘弹性连续损伤 (VECD) 理论被应用来分析疲劳治愈测试结果.
- 原子力显微镜 (AFM) 和富里埃变换红外光谱 (FTIR) 用于检查微观结构和化学变化.
主要成果:
- 采用岩石青延长了疲劳寿命,但在FAM混合物中降低了自我愈合能力.
- 紫外线老化,冷解和联合老化显著降低了疲劳和自我愈合特性.
- 与岩石青的FAM混合物表现出对环境退化增强的弹性.
- AFM显示,紫外线衰老改变了蜜蜂结构,而岩石青改善了它们的分布和均性.
- 根据FTIR,岩石青减轻了UV衰老引起的碳和硫氧化物指数的增加,改善了抗衰老能力.
结论:
- 岩石青提高了FAM混合物的疲劳性能和耐老化性能,尽管自我愈合能力有所降低.
- 含有岩石青的FAM混合物在具有挑战性的环境条件下表现出优越的耐用性.
- 该研究提供了关于使用岩石青作为改性剂来提高青路面性能和寿命的有价值的见解.
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