NON DESTRUCTIVE MONITORING IN LABORATORY. UNDERSTANDING OF DAMAGING PROCESSES BY THE USE OF NMR ON MASONRY

机译：实验室的非破坏性监测。通过核磁共振在砌体上对破坏过程的理解

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Moisture content in laboratory specimens is generally determined by weighing the complete specimen, whereas moisture and salt distribution have to be assessed in a destructive way, either by slicing the specimen or by drilling powder at different depths. Disadvantage is that the result is rather imprecise or that the specimen is partially or completely destroyed as a part of the analysis procedure. MNR offers the opportunity to monitor moisture transport and to assess moisture distribution as a function of time, without the necessity to destroy the specimen. The use of NMR will be shown here in the context of damage analysis and as part of the research aiming at developing better compatible mortars for the observed damage case. Frost damage to bedding mortar appears to be a recurrent type of damage found in many restored Dutch monuments. The use of incompatible re-pointing mortar in the restoration was found to be an important cause of the damage. An example from practice of such a damage is shown and the research aiming at developing better compatible re-pointing mortars is shortly described, referring to the help NMR can offer in the understanding of the moisture transport process taking place in the brick-mortar system.

机译：实验室样品中的水分含量通常是通过称量整个样品来确定的，而水分和盐分的分布必须以破坏性的方式进行评估，方法是将样品切片或在不同深度钻孔。缺点是结果不够精确，或者作为分析过程的一部分，样本被部分或完全破坏。 MNR提供了监测水分传输和评估水分随时间变化的机会，而无需破坏样品。 NMR的使用将在损伤分析的背景下显示出来，并且是研究的一部分，目的是针对观察到的损伤情况开发更好的相容砂浆。床上用品砂浆的霜冻损坏似乎是在许多已修复的荷兰古迹中经常出现的损坏类型。发现在修复体中使用不相容的指向砂浆是造成损坏的重要原因。展示了这种损坏的实例，并简要介绍了旨在开发更好的相容性指向砂浆的研究，其中提到NMR可以帮助理解砖砂浆体系中发生的水分传输过程。

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《RILEM TC 177-MDT Workshop on On-Site Control and Non-Destructive Evaluation of Masonry Structures; Nov 12-14, 2001; Mantova, Italy》|2001年|p.137-145|共9页
会议地点 Mantova(IT)
作者
Rob P.J. van Hees; Leo Pel; Tomas Wijffels; Loek van der Klugt;
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作者单位

TNO Building and Construction Research, Delft -Netherlands;

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原文格式 PDF
正文语种 eng
中图分类建筑科学;
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NON DESTRUCTIVE MONITORING IN LABORATORY. UNDERSTANDING OF DAMAGING PROCESSES BY THE USE OF NMR ON MASONRY

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