The NMR core analyzing tomograph:a multi-functional tool for non-destructive testing of building materials  

作　　者：Sabine Kruschwitz Sarah Munsch Melissa Telong Wolfram Schmidt Thilo Bintz Matthias Fladt Ludwig Stelzner 

机构地区：[1]Bundesanstalt für Materialforschung und-prüfung,Unter den Eichen 87,Berlin,12205,Germany [2]Technische Universitat Berlin,Gustav-Meyer-Allee 25,Berlin,13355,Germany

出　　处：《Magnetic Resonance Letters》2023年第3期207-219,I0003,共14页磁共振快报（英文）

摘　　要：NMR is becoming increasingly popular for the investigation of building materials as it is a non-invasive technology that does not require any sample preparation nor causes damage to the material.Depending on the specific application it can offer insights into properties like porosity and spatial saturation degree as well as pore structure.Moreover it enables the determination of moisture transport properties and the(re-)distribution of internal moisture into different reservoirs or chemical phases upon damage and curing.However,as yet most investigations were carried out using devices originally either designed for geophysical applications or the analysis of rather homogeneous small scale(<10 mL)samples.This paper describes the capabilities of an NMR tomograph,which has been specifically optimized for the investigation of larger,heterogeneous building material samples(diameters of up to 72 mm,length of up to 700 mm)with a high flexibility due to interchangeable coils allowing for a high SNR and short echo times(50-80 ms).

关 键 词：Natural stone Concrete Sensitivity Moisture transport Cement hydration Supplementary cementitious materials Frost and salt attack Fire spalling 

分 类 号：TB34[一般工业技术—材料科学与工程]