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Application of 1H proton NMR relaxometry to building materials – A review
Journal of Magnetic Resonance Open Pub Date : 2021-02-13 , DOI: 10.1016/j.jmro.2021.100012
Sarah Mandy Nagel , Christoph Strangfeld , Sabine Kruschwitz

Since nuclear magnetic resonance with focus on 1H protons is highly sensitive to pore filling fluids, it is nowadays often applied for the investigation of porous media. Mainly in materials research and especially in the field of non-destructive testing in civil engineering it is increasingly used. Scientific questions about and based on NMR meanwhile cover a broad spectrum.

To give an overview, we have reviewed various studies dealing with the determination of moisture contents and parameters such as the pore-size distribution, surface relaxivity, porosity, etc. In some papers, the monitoring of moisture transport in connection with degradation processes or admixtures was the main objective. In other papers, NMR was used for pore space analysis or even applied on site to assess the state of conservation of cultural heritage. Building materials that have been investigated in the presented studies are for example cement, concrete, woods, sandstones etc.

In this paper, short descriptions and the significant results of the reviewed articles are summarized and their measurement problems and discrepancies are pointed out. A special feature of this review article is the concise tabular compilation of determined T1 and T2 relaxation times, as well as of surface relaxivity values for various materials and components. Finally, relevant aspects are summed up and conclusions about the increasing potential of NMR relaxometry for investigations of porous building materials are drawn, followed by an outlook about future applications and the need for technical development.



中文翻译:

应用范围 1个氢质子核磁共振弛豫法对建筑材料的研究进展

自核磁共振以来 1个H质子对孔填充液高度敏感,如今它通常用于研究多孔介质。主要在材料研究中,尤其是在土木工程的非破坏性测试领域中,越来越多地使用它。同时,有关NMR并基于NMR的科学问题涵盖了广泛的领域。

作为概述,我们回顾了有关确定水分含量和参数(例如孔径分布,表面弛豫度,孔隙率等)的各种研究。在某些论文中,与降解过程或掺合料有关的水分迁移监测是主要目标。在其他论文中,NMR用于孔隙空间分析,甚至用于现场评估文化遗产的保存状态。在本研究中已研究过的建筑材料例如是水泥,混凝土,木材,砂岩等。

本文对综述文章的简短描述和重要成果进行了总结,指出了它们的测量问题和差异。这篇评论文章的一个特色是简洁明了的表格汇编Ť1个Ť2个弛豫时间,以及各种材料和组件的表面弛豫值。最后,总结了相关方面,并得出了有关NMR弛豫法在多孔建筑材料研究中潜力不断提高的结论,然后展望了未来的应用和技术发展的需要。

更新日期:2021-02-26
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