使用FIB-SEM纳米图谱探测钢混凝土接口微结构.
Thilo Schmid1, Nicolas Ruffray1, Michele Griffa2
1ETH Zürich, Laura-Hezner-Weg 7, 8093 Zürich, Switzerland.
概括
聚焦离子束扫描电子显微镜 (FIB-SEM) 纳米图解揭示了钢混凝土接口 (SCI) 的详细3D孔隙结构. 这种先进的技术捕获了对了解钢筋混凝土耐用性和腐蚀至关重要的微观结构特征.
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.
- 腐蚀科学 腐蚀科学
背景情况:
- 钢混凝土接口 (SCI) 对钢筋混凝土的耐用性至关重要,但其影响腐蚀的特征尚不清楚.
- 复杂的SCI异质性和缺乏合适的实验技术阻碍了研究.
研究的目的:
- 应用聚焦离子束扫描电子显微镜 (FIB-SEM) 纳米图形学用于SCI的高分辨率3D成像.
- 描述SCI的孔状结构及其与运输现象的相关性.
主要方法:
- 采用FIB-SEM纳米图谱来获得非腐蚀和腐蚀的SCI的3D断层图像.
- 开发了一种图像处理管道,用于将文物减少和细分成固体和孔隙阶段.
- 使用扩散扭曲性和多孔性配置文件分析了孔隙结构.
主要成果:
- 实现了30-50nm的声粒大小,捕获适合水分和离子运输的毛细血管孔.
- 在SCI孔隙结构中鉴定出明显的异质性.
- 突出了FIB-SEM在SCI上的应用的潜在陷和探测器考虑.
结论:
- FIB-SEM是一种可行的技术,用于SCI毛孔结构的高分辨率断层分析.
- 对FIB-SEM数据的数字分析可以为运输模型提供信息,以改善混凝土耐用性预测.
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